Anti-peeping display module and display device

Abstract

The present invention discloses an anti-peeping display module and a display device, which relate to the field of display technology, wherein a birefringence control type liquid crystal box is located between an in-plane conversion control type liquid crystal box and a backlight module, a display liquid crystal box is located on a side of the in-plane conversion control type liquid crystal box away from the backlight module, or the display liquid crystal box is located between the birefringence control type liquid crystal box and the backlight module, and the first direction is the thickness direction of the anti-peeping display module; polarizers are respectively arranged on two opposite sides of the birefringence control type liquid crystal box along the first direction, two opposite sides of the in-plane conversion control type liquid crystal box along the first direction, and two opposite sides of the display liquid crystal box along the first direction; the transmission axes of the polarizers located on both sides of the birefringence control type liquid crystal box are parallel, the transmission axes of the polarizers located on both sides of the in-plane conversion control type liquid crystal box are orthogonal, and the transmission axes of the polarizers located on both sides of the display liquid crystal box are orthogonal. This is conducive to effectively improving the anti-peeping performance of the display product.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to an anti-peeping display module and a display device. Background Art

[0002] With the development of display technology, display devices such as mobile phones and computers have been increasingly widely used. Generally, display devices have a large viewing angle, and users at different viewing angles can all know the information displayed. However, in some scenarios, users hope that the information displayed by the display device cannot be known by other users around them, that is, they hope that the display device has an anti-peeping function.

[0003] Although there are many anti-peeping products on the market, the anti-peeping effect is limited. How to further improve the anti-peeping performance of anti-peeping display products has become one of the technical problems that need to be solved urgently at this stage. Summary of the invention

[0004] In view of this, the present invention provides an anti-peeping display module and a display device, aiming to effectively improve the anti-peeping performance of the product.

[0005] In a first aspect, the present invention provides an anti-peeping display module, comprising: a backlight module, a birefringence control type liquid crystal cell, an in-plane switching control type liquid crystal cell and a display liquid crystal cell;

[0006] Along a first direction, the birefringence controlled liquid crystal cell is located between the in-plane switching controlled liquid crystal cell and the backlight module, the display liquid crystal cell is located on a side of the in-plane switching controlled liquid crystal cell away from the backlight module, or the display liquid crystal cell is located between the birefringence controlled liquid crystal cell and the backlight module, and the first direction is the thickness direction of the anti-peeping display module;

[0007] Polarizers are respectively arranged on two opposite sides of the birefringence-controlled liquid crystal box along the first direction, on two opposite sides of the in-plane conversion-controlled liquid crystal box along the first direction, and on two opposite sides of the display liquid crystal box along the first direction; the transmission axes of the polarizers located on both sides of the birefringence-controlled liquid crystal box are parallel, the transmission axes of the polarizers located on both sides of the in-plane conversion-controlled liquid crystal box are orthogonal, and the transmission axes of the polarizers located on both sides of the display liquid crystal box are orthogonal.

[0008] In a second aspect, the present invention further provides a display device, comprising the anti-peeping display module provided in the first aspect of the present invention.

[0009] Compared with the related art, the anti-peeping display module and display device provided by the present invention achieve at least the following beneficial effects:

[0010] In the anti-peeping display module and display device provided by the embodiment of the present invention, a birefringence controlled liquid crystal cell and an in-plane conversion controlled liquid crystal cell are introduced on the basis of the display liquid crystal cell. The transmission axes of the polarizers on both sides of the birefringence controlled liquid crystal cell are parallel. When the liquid crystal is not powered, the liquid crystal maintains the initial state and does not change the polarization state at the vertical and oblique viewing angles; when the liquid crystal is powered, the liquid crystal state changes, the polarization state at the vertical viewing angle does not change, and the polarization state at the oblique viewing angle changes, so that most of the light at the oblique viewing angle cannot pass through the polarizer. The transmission axes of the polarizers on both sides of the in-plane conversion controlled liquid crystal cell are orthogonal. When the liquid crystal is not powered, the angle between the liquid crystal and the transmission axis of the polarizer is 45°, and the polarization state of the incident light changes (the polarization state rotates 90 degrees), so that it passes through the polarizer; when the liquid crystal is powered, the polarization state at the vertical viewing angle will still deflect nearly 90 degrees, and the polarization state at the oblique viewing angle will hardly change, so that only a small part of the oblique light can pass through the polarizer. By using a method of cooperating a birefringence-controlled liquid crystal box and an in-plane-controlled liquid crystal box, light can pass through the polarizer normally in the shared mode; in the anti-peeping mode, the liquid crystals of the birefringence-controlled liquid crystal box and the in-plane-controlled liquid crystal box are tilted at the same time, and there is a phase difference in the oblique angle. The oblique angle light between each two layers of upper and lower polarizers will undergo a large change in polarization state, thereby increasing the light collection effect by a multiple, thereby improving the anti-peeping performance of the anti-peeping display module and the display device by a multiple.

[0011] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0012] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0014] Figure 1 FIG. 1 is a schematic structural diagram of an anti-peeping display module provided by an embodiment of the present invention;

[0015] Figure 2 FIG. 1 is a schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0016] Figure 3 The figure shows a schematic diagram of a structure of liquid crystal in a birefringence controlled liquid crystal cell in an initial arrangement state;

[0017] Figure 4 The figure shows a schematic diagram of the arrangement of liquid crystal in a birefringence controlled liquid crystal cell after being acted upon by an electric field;

[0018] Figure 5 The figure shows a viewing angle effect diagram of the anti-peeping display module provided by an embodiment of the present invention in a sharing mode;

[0019] Figure 6 The figure shows a viewing angle effect diagram of the anti-peeping display module provided by an embodiment of the present invention in a sharing mode;

[0020] Figure 7 The figure shows the horizontal brightness ratio diagram of the anti-peeping display module provided by the embodiment of the present invention in the anti-peeping mode and the sharing mode;

[0021] Figure 8 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0022] Fig. 9 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0023] Fig.10 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0024] Fig.11 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0025] Fig.12 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0026] Fig.13 FIG. 1 is a schematic diagram of a film layer of a backlight module provided by an embodiment of the present invention;

[0027] Fig.14 FIG. 1 is another schematic diagram of a film layer of a backlight module provided by an embodiment of the present invention;

[0028] Fig.15 FIG. 1 is another schematic diagram of a film layer of a backlight module provided by an embodiment of the present invention;

[0029] Fig.16 FIG. 1 is another schematic diagram of a film layer of a backlight module provided by an embodiment of the present invention;

[0030] Fig.17 FIG. 1 is a schematic diagram of a film layer of a birefringence controlled liquid crystal cell in an anti-peeping display module provided by an embodiment of the present invention;

[0031] Fig.18 The figure shows a structural schematic diagram of the first electrode layer in the birefringence controlled liquid crystal cell;

[0032] Fig.19Another schematic diagram of the structure of the first electrode layer in the birefringence controlled liquid crystal cell is shown;

[0033] Fig. 20 The figure shows a film layer schematic diagram of an in-plane switching control type liquid crystal cell in an anti-peeping display module provided by an embodiment of the present invention;

[0034] Fig.21 Shown is a schematic structural diagram of a first electrode layer in an in-plane switching control type liquid crystal cell;

[0035] Fig. 22 Another schematic diagram of the structure of the first electrode layer in the in-plane switching control type liquid crystal cell is shown;

[0036] Fig.23 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention;

[0037] Fig.24 FIG. 1 is a schematic diagram of a structure of a touch electrode provided by an embodiment of the present invention;

[0038] Fig.25 FIG. 2 is another schematic diagram of the structure of a touch electrode provided in an embodiment of the present invention;

[0039] Fig.26 FIG. 1 is a schematic diagram of a structure of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] It is obvious to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other without contradiction.

[0045] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] Figure 1 FIG. 1 is a schematic diagram of a structure of an anti-peeping display module provided by an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of a film layer of an anti-peeping display module provided in an embodiment of the present invention. Please refer to FIG. Figure 1 and Figure 2 An anti-peeping display module 100 provided by an embodiment of the present invention comprises: a backlight module 10, a birefringence control type liquid crystal cell 20, an in-plane switching control type liquid crystal cell 30 and a display liquid crystal cell 40;

[0047] Along the first direction D1, the birefringence control type liquid crystal cell 20 is located between the in-plane switching control type liquid crystal cell 30 and the backlight module 10, and the display liquid crystal cell 40 is located on the side of the in-plane switching control type liquid crystal cell 30 away from the backlight module 10, or the display liquid crystal cell 40 is located between the birefringence control type liquid crystal cell 20 and the backlight module 10. The first direction D1 is the thickness direction of the anti-peeping display module 100;

[0048] Polarizers 50 are respectively arranged on two opposite sides of the birefringence controlled liquid crystal box 20 along the first direction, on two opposite sides of the in-plane switching controlled liquid crystal box 30 along the first direction, and on two opposite sides of the display liquid crystal box 40 along the first direction; the transmission axes of the polarizers 50 located on both sides of the birefringence controlled liquid crystal box 20 are parallel, the transmission axes of the polarizers 50 located on both sides of the in-plane switching controlled liquid crystal box 30 are orthogonal, and the transmission axes of the polarizers 50 located on both sides of the display liquid crystal box 40 are orthogonal.

[0049] It should be noted that Figure 1 The anti-peeping display module with a rectangular structure is only taken as an example for description, and the actual shape of the anti-peeping display module in the present invention is not limited. In some other embodiments of the present invention, the anti-peeping display module can also be embodied in other shapes such as a rounded rectangle and a circle. Figure 1 The display module is shown to include a plurality of sub-pixels P arranged in an array, and the shape, number and arrangement of the sub-pixels P are not limited. Figure 2Only a relative position relationship of the backlight module 10, the birefringence control type liquid crystal cell 20, the in-plane switching control type liquid crystal cell 30 and the display liquid crystal cell 40 in the anti-peeping display module is illustrated, which does not represent the actual number and size of film layers. Figure 2 The embodiment only takes the solution in which the display liquid crystal box 40 is located on the side of the in-plane conversion control liquid crystal box 30 away from the backlight module 10 as an example for explanation. In some other embodiments of the present invention, the display liquid crystal box 40 can also be located between the birefringence control liquid crystal box 20 and the backlight module 10, which will be explained in subsequent embodiments.

[0050] In the anti-peeping display module 100 provided by the embodiment of the present invention, a birefringence controlled liquid crystal cell 20 and an in-plane conversion controlled liquid crystal cell 30 are introduced on the basis of the display liquid crystal cell 40. The transmission axes of the polarizers 50 located on both sides of the birefringence controlled liquid crystal cell 20 are parallel. When the liquid crystal is not powered, the liquid crystal maintains the initial state and does not change the polarization state at the vertical and oblique viewing angles; when the liquid crystal is powered, the liquid crystal state changes, the polarization state at the vertical viewing angle does not change, and the polarization state at the oblique viewing angle changes, so that most of the light at the oblique viewing angle cannot pass through the polarizer. The transmission axes of the polarizers 50 located on both sides of the in-plane conversion controlled liquid crystal cell 30 are orthogonal. When the liquid crystal is not powered, the angle between the transmission axes of the liquid crystal and the polarizer is 45°, and the polarization state of the incident light changes (the polarization state rotates 90 degrees), so that the light can pass through the polarizer normally; when the liquid crystal is powered, the polarization state at the vertical viewing angle will still deflect nearly 90 degrees, and the polarization state at the oblique viewing angle will hardly change, so that only a small part of the oblique light can pass through the polarizer. By adopting the method of cooperating with the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30, light can pass through the polarizer normally in the sharing mode; in the anti-peeping mode, the liquid crystals of the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30 are tilted at the same time, and there is a phase difference in the oblique angle. The oblique angle light between each two layers of upper and lower polarizers will undergo a large change in polarization state, which will increase the light collection effect by a factor, so that the anti-peeping performance of the anti-peeping display module is improved by a factor, thereby greatly improving the anti-peeping effect of the anti-peeping display module in the anti-peeping mode.

[0051] Optionally, in the anti-peeping display module provided in the embodiment of the present invention, the display liquid crystal box 40 refers to a liquid crystal box provided with color resistance and actually performing the picture display function, and the birefringence control liquid crystal box 20 and the in-plane conversion control liquid crystal box 30 are liquid crystal boxes for dimming the light emitted by the backlight module 10 (for example, the light emitted from the display liquid crystal box 40 can be adjusted to the light of the sharing mode or the light of the anti-peeping mode), both of which include two opposite substrates and liquid crystal molecules filled between the two substrates, and an electrode structure is provided on the surface of the two substrates facing the liquid crystal molecules, but no color resistance structure is provided on the two substrates, and no complex driving circuit is provided, and only the wiring for providing signals to the electrodes is provided. The specific structures of the display liquid crystal box 40, the birefringence control liquid crystal box 20 and the in-plane conversion control liquid crystal box 30 will be described in the following embodiments. The polarizers 50 provided on the upper and lower sides of the display liquid crystal box 40 are used to control the picture display, and the transmission axes of the two are orthogonal.

[0052] Optionally, in the anti-peeping display module provided by the embodiment of the present invention, the birefringence-controlled liquid crystal box 20 is filled with liquid crystal molecules, wherein the liquid crystal molecules can be single-axis positive liquid crystals or single-axis negative liquid crystals. Optionally, the positive liquid crystal corresponds to a pretilt angle of 0° to 10°, the negative liquid crystal corresponds to a pretilt angle of 85° to 95°, the alignment direction is 0° or 90°, and the liquid crystal alignment direction is perpendicular or parallel to the absorption axis angles of the polarizers located on the upper and lower sides of the birefringence-controlled liquid crystal box 20, and the absorption axis angles of the polarizers located on the upper and lower sides of the birefringence-controlled liquid crystal box 20 are parallel.

[0053] Optionally, the in-plane switching control type liquid crystal box 30 is an IPS (In-Plane Switching) viewing angle control box liquid crystal, in which the liquid crystal can be a single optical axis positive liquid crystal or a single optical axis negative liquid crystal, the positive liquid crystal corresponds to a pre-tilt angle of 0° to 10°, the alignment direction is 45° or 135°, and the absorption axis angles of the polarizers on both sides of the in-plane switching control type liquid crystal box 30 are vertical.

[0054] When no electric field is applied, the liquid crystal molecules in the birefringence controlled liquid crystal cell 20 maintain their initial arrangement state, for example, completely "lying flat" or "standing upright" in the liquid crystal cell, for example, see Figure 3 , Figure 3 FIG. 2 is a schematic diagram showing a structure of the liquid crystal in the birefringence controlled liquid crystal cell 20 in the initial arrangement state. Figure 3Take the example of the liquid crystal molecules completely "lying flat" in the liquid crystal box when no power is applied. In the refraction-controlled liquid crystal box, light propagates along the optical axis, and the two orthogonal light waves advance at the same speed. There is no phase difference in this direction, and the light does not change in any optical properties, so there is no brightness loss. When the in-plane conversion control liquid crystal box 30 is not powered, similar to the IPS white state display principle, there is a phase difference in the viewing angle direction, and a wide viewing angle characteristic can be obtained. Therefore, when the birefringence control liquid crystal box 20 and the in-plane conversion control liquid crystal box 30 are not powered, the anti-peeping display module as a whole is displayed in a shared mode.

[0055] On the contrary, Figure 4 As shown, when an electric field is applied to the liquid crystal molecules in the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30, the liquid crystal molecules in the birefringence-controlled liquid crystal box 20 and the liquid crystal molecules in the in-plane conversion-controlled liquid crystal box 30 are rearranged, and the liquid crystals in the two liquid crystal boxes change from a "lying flat" or "standing upright" state to a tilted state. There is an angle between the incident light and the optical axis. When observed at the center viewing angle, there is no phase difference, the light does not have any changes in optical properties, and there is no loss in the center brightness. When observed along the side viewing angle, there is a phase difference in both vibration directions of the light, and part of the light cannot be emitted from above the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30, so the brightness of the side viewing angle is reduced, or it will not be displayed to the observer at the side viewing angle. That is, when an electric field is applied to the liquid crystal molecules in the refraction-controlled liquid crystal box and the in-plane conversion-controlled liquid crystal box 30, the anti-peeping display module operates in a narrow viewing angle mode (anti-peeping mode). Among them, Figure 4 The figure shows a schematic diagram of the arrangement of the liquid crystal in the birefringence controlled liquid crystal cell 20 after being acted upon by an electric field.

[0056] The following will be combined Figures 5 to 7 The anti-peeping effect of the anti-peeping display module of this embodiment is further described, wherein: Figure 5 FIG. 1 is a perspective effect diagram of the anti-peeping display module provided by an embodiment of the present invention in a sharing mode. Figure 6 FIG. 1 is a perspective effect diagram of the anti-peeping display module provided by an embodiment of the present invention in a sharing mode. Figure 7The figure shows the horizontal brightness ratio diagram of the anti-peeping display module provided by the embodiment of the present invention in the anti-peeping mode and the sharing mode. Assume that the anti-peeping and sharing performance of the anti-peeping display module is described with the 45° brightness light collection ratio P45, where P45=L45° / L0°, where L45° is the brightness of the horizontal right oblique viewing angle of 45°, and L0° is the vertical viewing angle brightness. When the birefringence control liquid crystal box 20 and the in-plane conversion control liquid crystal box 30 are simultaneously introduced into the anti-peeping display module, in the anti-peeping mode, P45<0.4%; in the sharing mode, P45>93%; the sharing / anti-peeping P45 ratio is 232:1, and the anti-peeping effect is better. Moreover, when the birefringence control liquid crystal box 20 and the in-plane conversion control liquid crystal box 30 are combined, in the anti-peeping mode, the light of the upper left, upper right and other oblique viewing angles can be converged, so the anti-peeping effect in the anti-peeping mode can be further optimized.

[0057] In an optional embodiment of the present invention, the phase difference of the liquid crystal in the birefringence controlled liquid crystal box 20 is 500nm to 800nm. When not powered on, it is in sharing mode; when powered on, it switches to anti-peeping mode, and the liquid crystal tilts about 30 to 60°, and the most preferred liquid crystal tilt is 45°. When the phase difference of the liquid crystal in the birefringence controlled liquid crystal box 20 is less than 500nm or greater than 800nm, in the anti-peeping mode, the light emitted through the birefringence controlled liquid crystal box 20 may leak light at a large viewing angle, affecting the anti-peeping effect of the anti-peeping display module. Moreover, when the phase difference of the above-mentioned liquid crystal is greater than 800nm, the anti-peeping display module will also have color deviation, affecting the display effect. Therefore, when the phase difference of the liquid crystal in the birefringence controlled liquid crystal box 20 is set to 500nm to 800nm ​​in the present application, it is not only beneficial to improve the anti-peeping performance of the anti-peeping display module, but also to avoid the occurrence of display color deviation, so it is also beneficial to improve the overall display effect of the anti-peeping display module. Optionally, the phase difference of the liquid crystal in the birefringence controlled liquid crystal cell 20 is 650nm-700nm, and the anti-peeping performance and display effect are better at about 660nm.

[0058] In an optional embodiment of the present invention, the phase difference of the liquid crystal in the in-plane conversion control type liquid crystal box 30 is 600nm~900nm. When not powered on, the liquid crystal orientation direction is 45° / 135°; when powered on, the liquid crystal tilts and stands at about 30°~60°, preferably 45°. When the phase difference of the liquid crystal in the in-plane conversion control type liquid crystal box 30 is less than 600nm or greater than 900nm, in the anti-peeping mode, the light emitted through the birefringence control type liquid crystal box 20 may leak light at a large viewing angle, affecting the anti-peeping effect of the anti-peeping display module, and in the sharing mode, it will also cause the center brightness to be low, affecting the display effect of the sharing mode. Therefore, when the phase difference of the liquid crystal in the in-plane conversion control type liquid crystal box 30 is set to 600nm~900nm in the present application, it is beneficial to improve the anti-peeping performance of the anti-peeping display module, and will not affect the center brightness in the sharing mode, so it is also beneficial to improve the display effect in the sharing mode.

[0059] Continue to refer Figure 2 In an optional embodiment of the present invention, the display liquid crystal box 40 is located on the side of the in-plane conversion control type liquid crystal box 30 away from the backlight module 10, a first polarizer 51 is arranged between the backlight module 10 and the birefringence control type liquid crystal box 20, a second polarizer 52 is arranged between the birefringence control type liquid crystal box 20 and the in-plane conversion control type liquid crystal box 30, a third polarizer 53 is arranged between the in-plane conversion control type liquid crystal box 30 and the display liquid crystal box 40, and a fourth polarizer 54 is arranged on the side of the display liquid crystal box 40 away from the backlight module 10; the transmission axes of the first polarizer 51, the second polarizer 52 and the fourth polarizer 54 are parallel, and the transmission axes of the third polarizer 53 and the fourth polarizer 54 are orthogonal.

[0060] Specifically, when a display liquid crystal box 40 and two viewing angle control liquid crystal boxes (a birefringence control liquid crystal box 20 and an in-plane conversion control liquid crystal box 30) are introduced into the anti-peeping display module, four polarizers are introduced into the anti-peeping display module, so that each liquid crystal box has polarizers on the upper and lower sides. In this way, there is no need to set two polarizers separately for each liquid crystal box, and one polarizer can be shared between adjacent liquid crystal boxes. This is beneficial to reduce the number of polarizers in the anti-peeping display module, while improving the anti-peeping effect, it is also beneficial to simplify the film structure of the anti-peeping display module.

[0061] In addition, when the display liquid crystal box 40 is set at the top, that is, set on the side of the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30 away from the backlight module 10, when external light is irradiated to the anti-peeping display module, the display liquid crystal box 40 can absorb the external light and reduce reflection, which is also beneficial to improve the display effect of the anti-peeping display module under brighter ambient light.

[0062] Figure 8The figure shows another film layer schematic diagram of the anti-peeping display module provided by an embodiment of the present invention. In an optional implementation manner of the present invention, the display liquid crystal box 40 is located between the backlight module 10 and the birefringence controlled liquid crystal box 20, a first polarizer 51 is arranged between the backlight module 10 and the display liquid crystal box 40, a second polarizer 52 is arranged between the display liquid crystal box 40 and the birefringence controlled liquid crystal box 20, a third polarizer 53 is arranged between the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30, a fourth polarizer 54 is arranged on the side of the in-plane conversion controlled liquid crystal box 30 away from the birefringence controlled liquid crystal box 20, the light transmission axes of the first polarizer 51 and the fourth polarizer 54 are parallel, the light transmission axes of the second polarizer 52 and the third polarizer 53 are parallel, and the light transmission axes of the first polarizer 51 and the second polarizer 52 are orthogonal.

[0063] Specifically, this embodiment shows a solution of setting the display liquid crystal box 40 between the backlight module 10 and the birefringence controlled liquid crystal box 20. In the sharing mode, the liquid crystals in the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30 are not powered. After the light emitted by the backlight module 10 is emitted from the display liquid crystal box 40, when it passes through the birefringence controlled liquid crystal box 20 and the in-plane conversion controlled liquid crystal box 30, there is no change in the optical properties of the light, so there is no brightness loss, and display can be performed in the sharing mode. In the anti-peeping mode, power is supplied to the liquid crystals in the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30, and the state of the liquid crystal changes. After the light emitted by the backlight module 10 is emitted from the display liquid crystal box 40, the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30 can converge the light at the side viewing angle. When observed along the side viewing angle, there is a phase difference in both vibration directions of the light, and part of the light cannot be emitted from above the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30. Therefore, the brightness of the side viewing angle is reduced, or it will not be displayed to the observer at the side viewing angle, and better anti-peeping performance can also be achieved.

[0064] Fig. 9 Another film layer schematic diagram of the anti-peeping display module provided by an embodiment of the present invention is shown. In an optional implementation of the present invention, a common polarizer 502 is arranged between the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30, and the common polarizer 502 includes a metal wire grid.

[0065] Specifically, this embodiment is equivalent to using a metal wire grid structure to realize the shared polarizer 502 between the birefringence control type liquid crystal cell 20 and the in-plane switching control type liquid crystal cell 30, and the metal wire grid also has a polarization function. Figure 8Compared with the embodiment, it is equivalent to making the third polarizer 53 into a metal wire grid structure. Compared with conventional polarizers, the metal wire grid is thinner, which is beneficial to reducing the overall thickness of the anti-peeping display module while realizing the function of the polarizer.

[0066] Fig.10 Another film layer schematic diagram of the anti-peeping display module provided by an embodiment of the present invention is shown. In an optional implementation of the present invention, the birefringence-controlled liquid crystal box 20 and the in-plane switching-controlled liquid crystal box 30 include a common substrate 00. Along the first direction D1, the common substrate 00 is located between the liquid crystal of the birefringence-controlled liquid crystal box 20 and the liquid crystal of the in-plane switching-controlled liquid crystal box 30. The common polarizer 502 is located on the side of the common substrate 00 facing the liquid crystal in the birefringence-controlled liquid crystal box 20, or the common polarizer 502 is located on the side of the common substrate 00 facing the liquid crystal in the in-plane switching-controlled liquid crystal box 30.

[0067] Specifically, Fig.10 The illustrated embodiment shows a solution in which the birefringence control type liquid crystal cell 20 and the in-plane switching control type liquid crystal cell 30 share the same common substrate 00 when they are stacked. When the common polarizer 502 between the birefringence control type liquid crystal cell 20 and the in-plane switching control type liquid crystal cell 30 is made of a metal wire grid structure, the metal wire grid can be arranged on the side of the common substrate 00 facing the liquid crystal in the birefringence control type liquid crystal cell 20, for example Fig.10 In the structure shown, the metal wire grid can also be arranged on the side of the common substrate 00 facing the liquid crystal in the in-plane switching control type liquid crystal cell 30. In this way, only one common substrate 00 is required between the birefringence control type liquid crystal cell 20 and the in-plane switching control type liquid crystal cell 30, and there is no need to set different substrates for the two, which is more conducive to simplifying the film layer complexity of the anti-peeping display module, and setting the common polarizer on the common substrate 00 as a metal wire grid structure is also conducive to further reducing the thickness of the anti-peeping display module.

[0068] Fig.11 and Fig.12 Another schematic diagram of a film layer of the anti-peeping display module provided by the embodiment of the present invention is respectively shown, and specifically shows the structure when the positive A film 60 is introduced into the anti-peeping display module.

[0069] Please refer to Fig.12 In an optional embodiment of the present invention, the birefringence controlled liquid crystal cell 20 includes a first substrate 21 and a second substrate 22 arranged opposite to each other along a first direction, and the anti-peeping display module includes a first polarizer 51 and a second polarizer 52 corresponding to the birefringence controlled liquid crystal cell 20, the first polarizer 51 is located on a side of the first substrate 21 away from the second substrate 22, and the second polarizer 52 is located on a side of the second substrate 22 away from the first substrate 21;

[0070] The anti-peeping display module further includes at least one pair of positive A films 60 , wherein the at least one pair of positive A films 60 is located between the first substrate 21 and the first polarizer 51 , and / or the at least one pair of positive A films 60 is located between the second substrate 22 and the second polarizer 52 .

[0071] The positive A film 60 is a phase retardation film having a phase retardation value in the thickness direction, satisfying nz=ny<nx. Optionally, a pair of positive A films 60 are perpendicular to each other. The positive A film 60 uses the diameter on the equator of the Poincaré sphere as the rotation axis. When mutually perpendicular (90°) positive A films 60 are used, the angle on the Poincaré sphere is 180°, and the point on the central viewing angle is also on the equator. Therefore, when the Poincaré sphere passes through an even number of positive A films 60, it just rotates twice clockwise and counterclockwise and returns to its original position, so it has no effect on the central viewing angle. Therefore, when at least one pair of positive A films 60 is introduced on at least one side of the birefringence control type liquid crystal cell 20, it will not affect the front viewing angle of the anti-peeping display module. For the point at the oblique viewing angle, it is not on the equator of the Poincaré sphere. After the Poincaré sphere rotates through the odd layers and then passes through the even layers, it will not rotate back to the original position. The polarization state changes, so the oblique viewing angle is reduced. Therefore, when a pair of positive A films 60 are introduced on at least one side of the birefringence controlled liquid crystal box 20, it is beneficial to improve the anti-peeping performance of the anti-peeping display module.

[0072] It should be noted that the points on the equator of the Poincaré sphere represent linear polarized light, the upper and lower poles correspond to right-handed circularly polarized light and left-handed circularly polarized light respectively, and the other points on the sphere correspond to elliptically polarized light, of which the upper hemisphere is right-handed elliptically polarized light and the lower hemisphere is left-handed elliptically polarized light. The sphere represents fully polarized light. The center of the sphere represents natural light, and the other points in the sphere represent partially polarized light.

[0073] In an optional embodiment of the present invention, the phase difference of the positive A film 60 satisfies 150nm≤R0(550nm)≤520nm.

[0074] Specifically, different phase differences rotate at different angles on the Poincaré sphere. The larger the phase difference, the larger the rotation angle. When the phase difference of the positive A film 60 is set to 150nm≤R0(550nm)≤520nm, the rotation of the center viewing angle on the Poincaré sphere can just return to the original position, and the oblique viewing angle is just at the larger value of the change in polarization state, thus having a better oblique viewing angle privacy protection effect. If the phase difference is too large or too small, there will be some light leakage at the oblique viewing angle, affecting the privacy protection performance.

[0075] In an optional embodiment of the present invention, the phase difference of the positive A film 60 satisfies R0(550nm)=250nm, or R0(550nm)=500nm.

[0076] When the phase difference of the positive A film 6060 satisfies R0(550nm)=250nm, or R0(550nm)=500nm, it is helpful to ensure that the rotation of the center viewing angle point on the Poincaré sphere can just return to the original position, and the oblique viewing angle is just at the larger value of the polarization state change, which is more conducive to improving the anti-peeping effect of the anti-peeping display module.

[0077] Continue to refer Fig.11 In an optional embodiment of the present invention, a pair of positive A films 60 includes a first positive A film 61 and a second positive A film 62, the slow axis direction of the first positive A film 61 is 45°, and the slow axis direction of the second positive A film 62 is 135°. Specifically, when the slow axis angle of the first positive A film 61 is 45°, it is 90° on the Poincaré sphere, and when the slow axis direction of the second positive A film 62 is 135°, it is 270° on the Poincaré sphere, so that the left and right viewing angles can be symmetrical, and the center and left and right viewing angles are not greatly affected, and only the oblique viewing angle is affected.

[0078] Fig.13 Shown is a schematic diagram of a film layer of the backlight module 10 provided in an embodiment of the present invention. This embodiment is described by taking the backlight module 10 as an edge-entry backlight module 10 as an example, but is not limited to this. In some other embodiments of the present invention, the backlight module 10 can also be embodied as a direct-type backlight module 10, which will be described in subsequent embodiments.

[0079] Please combine Figure 2 , Figure 8 and Fig.13 In an optional embodiment of the present invention, the backlight module 10 includes a reflective sheet 11, a light guide plate 12, a diffusion film 13, a first prism film 14 and a second prism film 15, wherein, along a first direction, the reflective sheet 11 and the diffusion film 13 are respectively located on two opposite sides of the light guide plate 12, the first prism film 14 is located on a side of the diffusion film 13 away from the light guide plate 12, and the second prism film 15 is located on a side of the first prism film 14 away from the diffusion film 13.

[0080] Specifically, the amount of light emitted by the backlight module 10 directly affects the display brightness of the anti-peeping display module, and thus directly affects the display effect of the anti-peeping display module. In the embodiment of the present invention, two layers of prism films are introduced on the side of the diffusion film 13 in the backlight module 10 away from the light guide plate 12, namely the first prism film 14 and the second prism film 15. The two layers of prism films are arranged in a manner that is conducive to increasing the utilization rate of the light incident on the prism film, and part of the light incident on the first prism film 14 and the second prism film 15 is reflected by the prism structure and reused, and the other part of the light can be gathered to the center to achieve a brightening effect, so while improving the effective utilization rate of light, it is also conducive to improving the display brightness in the narrow viewing angle mode.

[0081] In an optional embodiment of the present invention, the extension directions of the prisms in the first prism film 14 and the prisms in the second prism film 15 are orthogonal.

[0082] When the extension direction of the prisms in the first prism film 14 is orthogonal to the extension direction of the prisms in the second prism film 15, the first prism film 14 and the second prism film 15 can play the role of concentrating light, so that the originally divergent light is concentrated as much as possible on the normal viewing angle. In this way, the brightness of the anti-peeping display module at the normal viewing angle is effectively improved, which is beneficial to improving the display effect of the anti-peeping display module at the normal viewing angle.

[0083] Fig.14 Shown is another film layer schematic diagram of the backlight module 10 provided in an embodiment of the present invention. This embodiment is described by taking the backlight module 10 as an edge-entry backlight module 10 as an example, but is not limited to this. In some other embodiments of the present invention, the backlight module 10 can also be embodied as a direct-type backlight module 10, which will be described in subsequent embodiments. Fig.14 The film structure of the backlight module 10 shown is equivalent to that in Fig.13 A double brightness enhancement film 16 is added on the basis of the backlight module 10.

[0084] Please refer to Figure 2 , Figure 8 and Fig.14 In an optional embodiment of the present invention, the backlight module 10 further includes a dual brightness enhancement film 16 , and the dual brightness enhancement film 16 is located on a side of the second prism film 15 away from the light guide plate 12 .

[0085] Specifically, in the backlight module 10 provided by the embodiment of the present invention, a dual-brightness brightening film 16 is introduced on the side of the second prism film 15 away from the first prism film 14. The dual-brightness brightening film 16 can be regarded as a reflective polarizer. By selectively reflecting the light of the light source 60 in the backlight module 10, the light in the light source 60 that may not be transmitted to the birefringence-controlled liquid crystal box 20 can be reused. In combination with the first prism film 14 and the second prism film 15, it is beneficial to further improve the display brightness of the anti-peeping display module. In addition, it can also effectively reduce the reflection moiré phenomenon that may occur in the anti-peeping display module, which is beneficial to further improve the display effect of the anti-peeping display module.

[0086] Fig.15 Shown is another film layer schematic diagram of the backlight module 10 provided in an embodiment of the present invention. This embodiment is described by taking the backlight module 10 as an edge-entry backlight module 10 as an example, but is not limited to this. In some other embodiments of the present invention, the backlight module 10 can also be embodied as a direct-type backlight module 10, which will be described in subsequent embodiments.

[0087] Please refer to Figure 2 , Figure 8 and Fig.15 In an optional embodiment of the present invention, the backlight module 10 includes a reflective sheet 11, a collimating light guide plate 18 and an inverse prism film 19, wherein along a first direction D1, the reflective sheet 11 and the inverse prism film 19 are respectively located on two opposite sides of the collimating light guide plate 18, and the inverse prism film 19 is located on a side of the collimating light guide plate 18 facing the display liquid crystal box 40.

[0088] Specifically, please combine Figure 2 and Fig.15 The anti-peeping display module provided in the embodiment of the present invention adopts Fig.15 In the structure of the backlight module 10 shown, the number of film layers of the backlight module 10 is relatively small, which is beneficial to reducing the overall thickness of the backlight module 10 and further beneficial to reducing the overall thickness of the anti-peeping display module.

[0089] In the backlight module 10 corresponding to this embodiment, after the light emitted by the light source is refracted by the dot structure of the collimating light guide plate 18, the direction of the light emitted from the surface of the collimating light guide plate 18 has a high degree of convergence and concentration. After this part of the light passes through the inverse prism film 19, the convex microstructure on the inverse prism film 19 can fully reflect and redirect the highly concentrated light transmitted by the collimating light guide plate 18 in the vertical direction, so that the optical viewing angle of the backlight module is highly collimated. This type of backlight module, when used in conjunction with the birefringence control type liquid crystal cell 20 and the in-plane conversion control type liquid crystal cell 30, enables the anti-peeping display module to have a better anti-peeping effect in the narrow viewing angle mode. In addition, when the collimating light guide plate 18 is used in conjunction with the inverse prism film 19, after the viewing angle converges, its vertical center brightness is greatly increased, so it is beneficial to reduce the power consumption caused by increasing the brightness of the anti-peeping display module. Therefore, while improving the display effect of the anti-peeping display module in the narrow viewing angle mode, it is also beneficial to improve the battery life of the anti-peeping display module.

[0090] Continue to refer Fig.15 In an optional embodiment of the present invention, the inverse prism film 19 includes a protruding microstructure 191 , and the protruding microstructure 191 is located on a side of the inverse prism film 19 facing the collimating light guide plate 18 .

[0091] Specifically, the embodiment of the present invention sets the raised microstructure 191 in the inverse prism film 19 to face the collimating light guide plate 18. The raised microstructure 191 has the effects of reflection, diffusion, light collection, and light mixing, so that the reflected light can be further evenly diffused and the brightness can be increased. When the inverse prism film 19 and the light guide plate 12 are used together, there is no need to introduce a diffusion film, a brightness enhancement film, and other structures separately, which is conducive to simplifying the structure of the backlight module 10, and further simplifies the overall structural complexity of the anti-peeping display module.

[0092] Figures 13 to 15 The embodiment shown takes the edge-type backlight module 10 as an example to illustrate the backlight module provided by the embodiment of the present invention. In some other embodiments of the present invention, the backlight module 10 can also be embodied as a direct-type backlight module. For example, please refer to Fig.16 , Fig.16 FIG. 1 is another schematic diagram of film layers of the backlight module 10 provided in an embodiment of the present invention.

[0093] In an optional embodiment of the present invention, the backlight module 10 includes a light guide plate 12 and a light source 60. Figures 13 to 15 , the light source 60 is located on the side of the light guide plate 12, or, please refer to Fig.16 The backlight module includes a substrate 000 and a light source 60 , and the light source 60 is located on a side of the substrate 000 facing the display liquid crystal box.

[0094] Specifically, when the light source 60 is located on the side of the light guide plate 12, the corresponding backlight module 10 is an edge-entry backlight module 10. It should be noted that the light guide plate 12 includes a light emitting surface parallel to the light emitting surface of the display module, and the side of the light guide plate 12 is a surface intersecting with the light emitting surface of the light guide plate; when the light source 60 is located on the side of the substrate 000 facing the display liquid crystal box 40, the corresponding backlight module 10 is a direct-type backlight module 10. Both the edge-entry backlight module 10 and the direct-type backlight module 10 can provide uniform light for the display liquid crystal box 40. When the direct-type backlight module 10 is used, optionally, the light source 50 uses mini LED, which is conducive to realizing the zoning control of different display areas of the anti-peeping display module, and is conducive to improving the display control flexibility of the anti-peeping display module; in addition, the direct-type backlight source can realize local dimming, so that the black state of the anti-peeping display module is pure black, the dynamic contrast is higher, and the display is clearer.

[0095] It should be noted that Figure 13-16 Only part of the structure of the backlight module is shown. In a specific implementation, the backlight module may also include a back plate, a plastic frame or an iron frame, a sheet metal, and other components for fixing the backlight module to the display liquid crystal box and the control type liquid crystal box. In addition, in the anti-peeping display module provided by the embodiment of the present invention, the control type liquid crystal box and the display liquid crystal box are fixedly connected, for example, they can be fixed by optical adhesive.

[0096] Fig.17 FIG. 2 is a schematic diagram of a film layer of a birefringence controlled liquid crystal cell 20 in an anti-peeping display module provided by an embodiment of the present invention. Fig.18 FIG. 1 is a schematic diagram showing a structure of the first electrode layer 71 in the birefringence controlled liquid crystal cell. Fig.19Another structural schematic diagram of the first electrode layer 71 in the birefringence controlled liquid crystal cell is shown. In an optional embodiment of the present invention, the birefringence controlled liquid crystal cell 20 includes a first substrate 21 and a second substrate 22 arranged opposite to each other and a first liquid crystal layer 23 arranged between the first substrate 21 and the second substrate 22; the first substrate 21 is located between the second substrate 22 and the backlight module 10; the first electrode layer 71 is arranged on the side of the first substrate 21 facing the first liquid crystal layer 23, and the second electrode layer 72 is arranged on the side of the second substrate 22 facing the first liquid crystal layer 23;

[0097] The first electrode layer 71 includes a whole surface of the first electrode 701 or a plurality of block-shaped first electrodes 701, and different block-shaped first electrodes 701 are respectively connected to different signal lines L0; the second electrode layer 72 includes a whole surface of the second electrode 702 (the structure of the whole surface of the second electrode can be referred to Fig.18 The structure of the first electrode 701 on the entire surface is not shown in the present application), and along the first direction D1, the first electrode 701 and the second electrode 702 overlap.

[0098] Specifically, in the embodiment of the present invention, a first electrode layer 71 and a second electrode layer 72 are provided in the birefringence controlled liquid crystal cell 20, the first electrode layer 71 is provided on the side of the first substrate 21 facing the liquid crystal layer, and the second electrode layer 72 is provided on the side of the second substrate 22 facing the liquid crystal layer. Optionally, the first electrode 701 and the second electrode 702 in the first electrode layer 71 and the second electrode layer 72 are both transparent electrodes. When voltages are applied to the first electrode 701 and the second electrode 702, respectively, an electric field that drives the liquid crystal molecules to deflect will be generated between the first electrode 701 and the second electrode 702, so that the anti-peeping display module enters the anti-peeping mode.

[0099] Optionally, the first electrode 701 and the second electrode 702 in the birefringence controlled liquid crystal cell 20 may be embodied as, for example, Fig.18 The whole-surface structure shown, for example, along the thickness direction of the anti-peeping display module, the first electrode 701 and the second electrode both cover at least the display area of ​​the display liquid crystal box. In this way, it is only necessary to provide corresponding voltage signals to the first electrode 701 and the second electrode 702 respectively to control the anti-peeping display module to enter the anti-peeping mode, which is conducive to simplifying the control process of the anti-peeping display module.

[0100] Optionally, the first electrode layer 71 in the embodiment of the present invention may further include a plurality of block-shaped first electrodes 701, for example, Fig.19Optionally, different block-shaped first electrodes 701 are respectively connected to different signal lines L0, so that the voltages of different block-shaped electrodes can be controlled in different areas, so that different areas of the same anti-peeping display module can enter different display modes, such as some areas are displayed in a shared mode, and some areas are displayed in an anti-peeping mode, thereby realizing flexible control of the display modes of different areas of the anti-peeping display module.

[0101] It should be noted that the number and size of the block-shaped first electrodes 701 included in the first electrode layer 71 can be flexibly set according to actual needs. Assuming that the anti-peeping display module is a horizontal screen display structure used in the field of vehicle-mounted display, the first electrode layer 71 can be divided into at least two block-shaped first electrodes 701 arranged along the long side direction of the display screen, so that the display modes corresponding to the driver's seat and the co-driver's seat can be controlled respectively, thereby improving the application flexibility of the anti-peeping display module. Of course, in some other embodiments of the present invention, the block-shaped first electrodes 701 can also be set to correspond one-to-one with the sub-pixels located in the display area of ​​the display liquid crystal box 40, so as to achieve refined control of the display modes of different areas of the anti-peeping display module.

[0102] Fig. 20 FIG. 1 is a schematic diagram of a film layer of an in-plane switching control type liquid crystal cell 30 in an anti-peeping display module provided by an embodiment of the present invention. Fig.21 FIG. 1 is a schematic diagram showing a structure of a first electrode layer 71 in an in-plane switching control type liquid crystal cell 30. Fig. 22 FIG. 1 is another schematic diagram of the structure of the first electrode layer 71 in the in-plane switching control type liquid crystal cell 30 .

[0103] Please refer to Figure 20 to Figure 22 In an optional embodiment of the present invention, the in-plane switching control type liquid crystal cell 30 includes a third substrate 31 and a fourth substrate 32 which are arranged opposite to each other and a second liquid crystal layer 33 which is arranged between the third substrate 31 and the fourth substrate 32; the third substrate 31 is located between the fourth substrate 32 and the backlight module 10; a third electrode layer 81 is arranged on a side of the third substrate 31 facing the second liquid crystal layer 33, and a fourth electrode layer 82 is arranged on a side of the fourth substrate 32 facing the second liquid crystal layer 33;

[0104] The third electrode layer 81 includes a whole surface of a third electrode 801 or a plurality of block-shaped third electrodes 801 , and different block-shaped third electrodes 801 are respectively connected to different signal lines L1 ; the fourth electrode layer 82 includes a whole surface of a fourth electrode 802 , and along the first direction, the third electrode 801 and the fourth electrode 802 overlap.

[0105] Specifically, in the embodiment of the present invention, a third electrode layer 81 and a fourth electrode layer 82 are provided in the in-plane conversion control type liquid crystal box 30, the third electrode layer 81 is provided on the side of the third substrate 31 facing the liquid crystal layer, and the fourth electrode layer 82 is provided on the side of the fourth substrate 32 facing the second liquid crystal layer 33. Optionally, the third electrode 801 and the fourth electrode 802 in the third electrode layer 81 and the fourth electrode layer 82 are both transparent electrodes. When voltage is applied to the third electrode 801 and the fourth electrode 802, respectively, an electric field that drives the liquid crystal to deflect will be generated between the third electrode 801 and the fourth electrode 802, so that the anti-peeping display module enters the anti-peeping mode.

[0106] Optionally, the third electrode 801 and the fourth electrode 802 in the internal switching control type liquid crystal cell 30 can be embodied as, for example Fig.21 As shown in the whole-surface structure, for example, along the thickness direction of the anti-peeping display module, the third electrode 801 and the fourth electrode 802 both cover at least the display area of ​​the display liquid crystal box. In this way, it is only necessary to provide corresponding voltage signals to the third electrode 801 and the fourth electrode 802 respectively to control the anti-peeping display module to enter the anti-peeping mode, which is conducive to simplifying the control process of the anti-peeping display module.

[0107] Optionally, the third electrode layer 81 in the embodiment of the present invention may further include a plurality of block-shaped third electrodes 801, for example, Fig. 22 Optionally, different block-shaped third electrodes 801 are respectively connected to different signal lines L1, so that the voltages of different block-shaped electrodes can be controlled in different areas, so that different areas of the same anti-peeping display module can enter different display modes, such as some areas are displayed in a shared mode, and some areas are displayed in an anti-peeping mode, thereby realizing flexible control of the display modes of different areas of the anti-peeping display module.

[0108] It should be noted that the number and size of the block third electrodes 801 included in the third electrode layer 81 can be flexibly set according to actual needs. Assuming that the anti-peeping display module is a horizontal screen display structure used in the field of vehicle-mounted display, the third electrode layer 81 can be divided into at least two block third electrodes 801 arranged along the long side direction of the display screen, so that the display modes corresponding to the driver's seat and the co-driver's seat can be controlled respectively, thereby improving the application flexibility of the anti-peeping display module. Of course, in some other embodiments of the present invention, the block third electrodes 801 can also be set to correspond one-to-one with the sub-pixels located in the display area of ​​the display liquid crystal box, so as to achieve refined control of the display modes of different areas of the anti-peeping display module.

[0109] Fig.23 FIG. 1 is another schematic diagram of a film layer of an anti-peeping display module provided by an embodiment of the present invention. In this embodiment, the structure of the display liquid crystal box 40 in the anti-peeping display module is refined. It should be noted that: Fig.23 The corresponding relationship between the number of pixel electrodes 92 and the number of common electrodes 91 shown in FIG. 1 is only for illustration. In fact, one common electrode 91 may correspond to a plurality of pixel electrodes 92. Fig.23 In an optional embodiment of the present invention, the display liquid crystal box 40 includes a color filter substrate 42 and an array substrate 41 that are relatively arranged, and a third liquid crystal layer 43 arranged between the color filter substrate 42 and the array substrate 41; the color filter substrate 42 includes a black matrix 421 and a color resist 422, the black matrix 421 defines a plurality of openings, and the color resist 422 is located and filled in the openings.

[0110] Specifically, the anti-peeping display module provided by the embodiment of the present invention is provided with three liquid crystal boxes, wherein the display liquid crystal box 40 includes a color film substrate 42 and an array substrate 41, and a color resist 422 is provided on the color film substrate 42, and optionally, the color resist at least includes red resist, green resist and blue resist, and the light emitted by the backlight module 10 forms light of corresponding colors when passing through the color resists 422 of different colors in the display liquid crystal box 40, thereby realizing the color display function of the anti-peeping display module. The color resist 422 on the color film substrate 42 of the display liquid crystal box 40 is arranged in the opening formed by the black matrix 421. When the external light is directed to the anti-peeping display module, the black matrix 421 in the display liquid crystal box 40 can absorb the external light, reduce or avoid the phenomenon of external light being reflected in the anti-peeping display module, thereby helping to reduce the reflectivity of the anti-peeping display module and improve its display effect in a high light intensity environment.

[0111] Continue to refer Fig.23 In an optional embodiment of the present invention, the display liquid crystal box 40 is located on the side of the in-plane conversion control type liquid crystal box 30 away from the backlight module 10, and the display liquid crystal box 40 includes a color filter substrate 42 and an array substrate 41 that are relatively arranged, the array substrate 41 includes a first substrate 410, the color filter substrate 42 includes a second substrate 420, and the display module also includes a touch electrode T, and the touch electrode T is located between the first substrate 410 and the second substrate 420.

[0112] Specifically, in the anti-peeping display module provided by the embodiment of the present invention, the display liquid crystal box 40 includes a color film substrate 42 and an array substrate 41 that are arranged relatively. When the touch electrode T is introduced into the anti-peeping display module so that the anti-peeping display module has a touch function, the present embodiment sets the touch electrode T in the display liquid crystal box 40 that is arranged near the light-emitting surface of the anti-peeping display module, specifically between the first substrate 410 of the array substrate 41 and the second substrate 420 of the color film substrate 42, so as to reduce the distance between the touch subject and the touch electrode T, increase the amount of coupling capacitance generated during the touch process, and thus help improve the touch performance of the anti-peeping display module. If the touch electrode T is set on the side of the display liquid crystal box 40 facing the backlight module 10, especially if the touch electrode T is set on the side of the birefringence control type liquid crystal box 20 or the in-plane conversion control type liquid crystal box 30 facing the backlight module 10, the electrode in the birefringence control type liquid crystal box 20 or the in-plane conversion control type liquid crystal box 30 is likely to shield the touch electrode, seriously affecting the stability and reliability of the touch. When the touch electrode T is arranged in the display liquid crystal box 40 in the present application, when the display liquid crystal box 40 is located on the side of the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30 away from the backlight module 10, the touch electrode T is also located on the side of the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30 away from the backlight module 10, and the electrodes in the birefringence-controlled liquid crystal box 20 and the in-plane conversion-controlled liquid crystal box 30 do not affect the touch electrode T in the display liquid crystal box 40. Therefore, the way in which the touch electrode T is arranged in the display liquid crystal box in the present application is also beneficial to improving the touch stability and reliability.

[0113] In addition, compared with the method of setting the touch electrode in an external form, the present application sets the touch electrode T in the display liquid crystal box 40, which is also beneficial to reducing the overall thickness of the anti-peeping display module.

[0114] Fig.24 FIG. 1 is a schematic diagram of a structure of a touch electrode T provided in an embodiment of the present invention. Fig.23 and Fig.24 In an optional embodiment of the present invention, the touch electrode T is a self-capacitive touch electrode; the display liquid crystal box 40 includes a pixel electrode 92 and a common electrode 91 arranged between a first substrate 410 and a second substrate 420, and the common electrode 91 includes a plurality of electrode blocks, and the common electrode 91 is reused as the touch electrode T.

[0115] Specifically, when the touch electrode T is introduced into the display liquid crystal, the common electrode 91 in the display liquid crystal box 40 is reused as the touch electrode T, so that there is no need to introduce a separate film layer for the touch electrode T in the display liquid crystal box 40, thereby simplifying the film layer structure of the display liquid crystal box 40 and simplifying the manufacturing process of the display liquid crystal box 40. When the common electrode 91 is reused as the touch electrode T, in the display stage, the common electrode 91 is used to transmit a common voltage signal; in the touch detection stage, the common electrode 91 is used to transmit a touch signal, thereby realizing time-division multiplexing of the common electrode 91.

[0116] Please refer to Fig.24 When the touch electrode T is a self-capacitive touch electrode, the electrode blocks reused as touch in the common electrode 91 are respectively connected to different signal lines L3. In the touch detection stage, when the coupling capacitance on the electrode block changes, the change signal will be able to be transmitted through the corresponding signal line, so as to determine the location where the touch occurs.

[0117] In an optional embodiment of the present invention, the common electrode 91 is located on the array substrate 41. When the common electrode 91 is disposed on the array substrate 41, the signal line L3 connected to the common electrode 91 can be directly extended to the fan-out area on the array substrate 41 and then electrically connected to the binding terminal of the binding area, thereby facilitating electrical connection with the driving chip or the flexible circuit board, which is conducive to simplifying the overall manufacturing process of the display liquid crystal box 40.

[0118] Fig.25 FIG. 1 is another schematic diagram of the structure of the touch electrode T provided in an embodiment of the present invention. Fig.23 and Fig.25 In an optional embodiment of the present invention, the touch electrode T is a mutual capacitive touch electrode, and the touch electrode T includes a touch drive electrode 93 and a touch sensing electrode 94 , and the touch drive electrode 93 and the touch sensing electrode 94 are both located on the array substrate 41 , or the touch drive electrode 94 and the touch sensing electrode 94 are both located on the color film substrate 42 .

[0119] Specifically, when the touch electrode T is a mutual capacitance touch electrode T, the embodiment of the present invention arranges the touch drive electrode 94 and the touch sensing electrode 94 on the same substrate, for example, both are arranged on the array substrate 41, or both are arranged on the color film substrate 42. Compared with the manner of respectively arranging the touch drive electrode 94 and the touch sensing electrode 94 on the array substrate 41 and the color film substrate 42, it is beneficial to reduce the distance between the touch drive electrode 94 and the touch sensing electrode 94. When the touch subject touches the anti-peeping display module, it is beneficial to increase the capacitance change between the touch drive electrode 94 and the touch sensing electrode 94, thereby facilitating improving the touch performance of the anti-peeping display module.

[0120] Based on the same inventive concept, the present invention also provides a display device, Fig.26 FIG. 1 is a schematic diagram of a structure of a display device provided by an embodiment of the present invention. Please refer to FIG. Fig.26 The display device 200 provided in the embodiment of the present invention includes the anti-peeping display module 100 provided in any of the above embodiments of the present invention.

[0121] It is understandable that the display device 200 provided in the embodiment of the present invention may be a mobile phone, a tablet, a computer, a television, a car display device or other display device with a display function, and the present invention does not specifically limit this. The display device provided in the embodiment of the present invention has the beneficial effects of the anti-peeping display module provided in the embodiment of the present invention. For details, please refer to the specific description of the anti-peeping display module in the above embodiments, and this embodiment will not be repeated here.

[0122] In summary, the anti-peeping display module and display device provided by the present invention achieve at least the following beneficial effects:

[0123] In the anti-peeping display module and display device provided by the embodiment of the present invention, a birefringence controlled liquid crystal cell and an in-plane conversion controlled liquid crystal cell are introduced on the basis of the display liquid crystal cell. The transmission axes of the polarizers on both sides of the birefringence controlled liquid crystal cell are parallel. When the liquid crystal is not powered, the liquid crystal maintains the initial state and does not change the polarization state at the vertical and oblique viewing angles; when the liquid crystal is powered, the liquid crystal state changes, the polarization state at the vertical viewing angle does not change, and the polarization state at the oblique viewing angle changes, so that most of the light at the oblique viewing angle cannot pass through the polarizer. The transmission axes of the polarizers on both sides of the in-plane conversion controlled liquid crystal cell are orthogonal. When the liquid crystal is not powered, the angle between the liquid crystal and the transmission axis of the polarizer is 45°, and the polarization state of the incident light changes (the polarization state rotates 90 degrees), so that it passes through the polarizer; when the liquid crystal is powered, the polarization state at the vertical viewing angle will still deflect nearly 90 degrees, and the polarization state at the oblique viewing angle will hardly change, so that only a small part of the oblique light can pass through the polarizer. By using a method of cooperating a birefringence-controlled liquid crystal box and an in-plane-controlled liquid crystal box, light can pass through the polarizer normally in the shared mode; in the anti-peeping mode, the liquid crystals of the birefringence-controlled liquid crystal box and the in-plane-controlled liquid crystal box are tilted at the same time, and there is a phase difference in the oblique angle. The oblique angle light between each two layers of upper and lower polarizers will undergo a large change in polarization state, thereby increasing the light collection effect by a multiple, thereby improving the anti-peeping performance of the anti-peeping display module and the display device by a multiple.

[0124] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An anti-peeping display module, characterized in that: include: Backlight module, birefringence controlled liquid crystal cell, in-plane switching controlled liquid crystal cell and display liquid crystal cell; Along a first direction, the birefringence controlled liquid crystal cell is located between the in-plane switching controlled liquid crystal cell and the backlight module, the display liquid crystal cell is located on a side of the in-plane switching controlled liquid crystal cell away from the backlight module, or the display liquid crystal cell is located between the birefringence controlled liquid crystal cell and the backlight module, and the first direction is the thickness direction of the anti-peeping display module; Polarizers are respectively arranged on two opposite sides of the birefringence-controlled liquid crystal box along the first direction, on two opposite sides of the in-plane conversion-controlled liquid crystal box along the first direction, and on two opposite sides of the display liquid crystal box along the first direction; the transmission axes of the polarizers located on both sides of the birefringence-controlled liquid crystal box are parallel, the transmission axes of the polarizers located on both sides of the in-plane conversion-controlled liquid crystal box are orthogonal, and the transmission axes of the polarizers located on both sides of the display liquid crystal box are orthogonal.

2. The anti-peeping display module according to claim 1, characterized in that: The display liquid crystal box is located on the side of the in-plane conversion control type liquid crystal box away from the backlight module, a first polarizer is arranged between the backlight module and the birefringence control type liquid crystal box, a second polarizer is arranged between the birefringence control type liquid crystal box and the in-plane conversion control type liquid crystal box, a third polarizer is arranged between the in-plane conversion control type liquid crystal box and the display liquid crystal box, and a fourth polarizer is arranged on the side of the display liquid crystal box away from the backlight module; the transmission axes of the first polarizer, the second polarizer and the fourth polarizer are parallel, and the transmission axes of the third polarizer and the fourth polarizer are orthogonal.

3. The anti-peeping display module according to claim 1, characterized in that: The display liquid crystal box is located between the backlight module and the birefringence controlled liquid crystal box, a first polarizer is arranged between the backlight module and the display liquid crystal box, a second polarizer is arranged between the display liquid crystal box and the birefringence controlled liquid crystal box, a third polarizer is arranged between the birefringence controlled liquid crystal box and the in-plane conversion controlled liquid crystal box, a fourth polarizer is arranged on the side of the in-plane conversion controlled liquid crystal box away from the birefringence controlled liquid crystal box, the first polarizer is parallel to the transmission axis of the fourth polarizer, the second polarizer is parallel to the transmission axis of the third polarizer, and the transmission axis of the first polarizer is orthogonal to the second polarizer.

4. The anti-peeping display module according to claim 1, characterized in that: A common polarizer is disposed between the birefringence-controlled liquid crystal cell and the in-plane switching-controlled liquid crystal cell, and the common polarizer includes a metal wire grid.

5. The anti-peeping display module according to claim 4, characterized in that: The birefringence-controlled liquid crystal box and the in-plane switching-controlled liquid crystal box include a common substrate. Along the first direction, the common substrate is located between the liquid crystal of the birefringence-controlled liquid crystal box and the liquid crystal of the in-plane switching-controlled liquid crystal box. The common polarizer is located on the side of the common substrate facing the liquid crystal in the birefringence-controlled liquid crystal box, or the common polarizer is located on the side of the common substrate facing the liquid crystal in the in-plane switching-controlled liquid crystal box.

6. The anti-peeping display module according to claim 1, characterized in that: The birefringence controlled liquid crystal cell comprises a first substrate and a second substrate arranged opposite to each other along the first direction, the anti-peeping display module comprises a first polarizer and a second polarizer corresponding to the birefringence controlled liquid crystal cell, the first polarizer is located on a side of the first substrate away from the second substrate, and the second polarizer is located on a side of the second substrate away from the first substrate; The anti-peeping display module further includes at least one pair of positive A films, wherein the at least one pair of positive A films is located between the first substrate and the first polarizer, and / or the at least one pair of positive A films is located between the second substrate and the second polarizer.

7. The anti-peeping display module according to claim 6, characterized in that: The phase difference of the positive A film satisfies 150nm≤R0(550nm)≤520nm.

8. The anti-peeping display module according to claim 7, characterized in that: The phase difference of the positive A film satisfies R0(550nm)=250nm, or R0(550nm)=500nm.

9. The anti-peeping display module according to claim 6, characterized in that: The pair of positive A films includes a first positive A film and a second positive A film, the slow axis direction of the first positive A film is 45°, and the slow axis direction of the second positive A film is 135°.

10. The anti-peeping display module according to claim 1, characterized in that: The backlight module includes a reflective sheet, a light guide plate, a diffusion film, a first prism film and a second prism film, wherein along the first direction, the reflective sheet and the diffusion film are respectively located on two opposite sides of the light guide plate, the first prism film is located on the side of the diffusion film away from the light guide plate, and the second prism film is located on the side of the first prism film away from the diffusion film.

11. The anti-peeping display module according to claim 10, characterized in that: The prisms in the first prism film and the prisms in the second prism film extend in directions that are orthogonal to each other.

12. The anti-peeping display module according to claim 11, characterized in that: The backlight module further comprises a dual brightness enhancement film, and the dual brightness enhancement film is located on a side of the second prism film away from the light guide plate.

13. The anti-peeping display module according to claim 1, characterized in that: The backlight module includes a reflective sheet, a collimating light guide plate and an inverse prism film, wherein along the first direction, the reflective sheet and the inverse prism film are respectively located on two opposite sides of the collimating light guide plate, and the inverse prism film is located on a side of the collimating light guide plate facing the display liquid crystal box.

14. The anti-peeping display module according to claim 13, characterized in that: The inverse prism film includes a convex microstructure, and the convex microstructure is located on a side of the inverse prism film facing the collimating light guide plate.

15. The anti-peeping display module according to claim 1, characterized in that: The backlight module includes a light guide plate and a light source, and the light source is located on the side of the light guide plate. Alternatively, the backlight module includes a substrate and a light source, and the light source is located on a side of the substrate facing the display liquid crystal box.

16. The anti-peeping display module according to claim 1, characterized in that: The birefringence controlled liquid crystal cell comprises a first substrate and a second substrate arranged opposite to each other and a first liquid crystal layer arranged between the first substrate and the second substrate; the first substrate is located between the second substrate and the backlight module; a first electrode layer is arranged on a side of the first substrate facing the first liquid crystal layer, and a second electrode layer is arranged on a side of the second substrate facing the first liquid crystal layer; The first electrode layer includes a whole surface of first electrodes or a plurality of block-shaped first electrodes, and different block-shaped first electrodes are respectively connected to different signal lines; the second electrode layer includes a whole surface of second electrodes, and along the first direction, the first electrode and the second electrode overlap.

17. The anti-peeping display module according to claim 1, characterized in that: The in-plane switching control type liquid crystal cell comprises a third substrate and a fourth substrate which are arranged opposite to each other and a second liquid crystal layer arranged between the third substrate and the fourth substrate; the third substrate is located between the fourth substrate and the backlight module; a third electrode layer is arranged on a side of the third substrate facing the second liquid crystal layer, and a fourth electrode layer is arranged on a side of the fourth substrate facing the second liquid crystal layer; The third electrode layer includes a whole surface of third electrodes or a plurality of block-shaped third electrodes, and different block-shaped third electrodes are respectively connected to different signal lines; the fourth electrode layer includes a whole surface of fourth electrodes, and along the first direction, the third electrode and the fourth electrode overlap.

18. The anti-peeping display module according to claim 1, characterized in that: The display liquid crystal box includes a color filter substrate and an array substrate arranged opposite to each other, and a third liquid crystal layer arranged between the color filter substrate and the array substrate; the color filter substrate includes a black matrix and a color resist, the black matrix defines a plurality of openings, and the color resist is located and filled in the openings.

19. The anti-peeping display module according to claim 1, characterized in that: The display liquid crystal box is located on a side of the in-plane conversion control type liquid crystal box away from the backlight module, and the display liquid crystal box includes a color filter substrate and an array substrate that are relatively arranged, the array substrate includes a first substrate, the color filter substrate includes a second substrate, and the display module also includes a touch electrode, and the touch electrode is located between the first substrate and the second substrate.

20. The anti-peeping display module according to claim 19, characterized in that: The touch electrode is a self-capacitive touch electrode; the display liquid crystal box includes a pixel electrode and a common electrode arranged between the first substrate and the second substrate, the common electrode includes a plurality of electrode blocks, and the common electrode is reused as the touch electrode.

21. The anti-peeping display module according to claim 20, characterized in that: The common electrode is located on the array substrate.

22. The anti-peeping display module according to claim 19, characterized in that: The touch electrodes are mutual capacitive touch electrodes, and the touch electrodes include touch drive electrodes and touch sensing electrodes, and the touch drive electrodes and the touch sensing electrodes are both located on the array substrate, or the touch drive electrodes and the touch sensing electrodes are both located on the color film substrate.

23. The anti-peeping display module according to claim 1, characterized in that: The phase difference of the liquid crystal in the birefringence control type liquid crystal cell is 500nm-800nm, and the phase difference of the liquid crystal in the in-plane switching control type liquid crystal cell is 600nm-900nm.

24. A display device, characterized in that: The anti-peeping display module comprises any one of claims 1 to 23.

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