Display panel, driving method, and display device

Abstract

The present invention discloses a display panel, a driving method and a display device. The display panel includes a dimming box and a display liquid crystal box; the dimming box includes a first substrate, a second substrate and a first liquid crystal layer, the first substrate is provided with a first viewing angle control electrode, and the second substrate is provided with a second viewing angle control electrode and a third viewing angle control electrode that cooperate with the first viewing angle control electrode; in a narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer are in a lying posture or a standing posture. In a wide viewing angle mode, by applying corresponding viewing angle control voltages to the first viewing angle control electrode, the second viewing angle control electrode and the third viewing angle control electrode, the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state, so that light can be scattered, and a wide viewing angle effect with a wider viewing angle range can be achieved in the case of a single dimming box; moreover, the dimming box does not need to be used in conjunction with a polarizer, which greatly reduces the thickness of the module and the number of polarizers to increase the transmittance of light.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a driving method, and a display device. Background Art

[0002] With the continuous advancement of liquid crystal display technology, the viewing angle of the display has been widened from the original 120° 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] like Figure 1 As shown, the prior art uses a dimming box 10 and a display liquid crystal box 20 to realize a dual-box structure for switching between a wide viewing angle and a narrow viewing angle, wherein the display liquid crystal box 20 is used for normal picture display, and the dimming box 10 is used for controlling the viewing angle switching. The dimming box 10 includes a first substrate 11, a second substrate 12, and a first liquid crystal layer 13 between the first substrate 11 and the second substrate 12. A first polarizer 31 is provided between the dimming box 10 and the display liquid crystal box 20, a second polarizer 32 is provided on the side of the display liquid crystal box 20 away from the dimming box 10, and a third polarizer 33 is provided on the side of the dimming box 10 away from the display liquid crystal box 20. The light transmission axes of the first polarizer 31 and the second polarizer 32 are perpendicular to each other, the light transmission axes of the first polarizer 31 and the third polarizer 33 are parallel to each other, and the alignment direction of the first liquid crystal layer 13 is parallel to the light transmission axes of the first polarizer 31 and the third polarizer 33. The first substrate 11 is provided with a first viewing angle control electrode 111, and the second substrate 12 is provided with a second viewing angle control electrode 121. Figure 1 and Figure 2 As shown, there is no voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and when the liquid crystal molecules in the first liquid crystal layer 13 maintain the initial flat state, the display panel presents a wide viewing angle mode; Figure 3 and Figure 4 As shown, of course, a large voltage difference (eg, 5V) can also be applied between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, so that the liquid crystal molecules in the first liquid crystal layer 13 are deflected to a vertical state, and the display panel presents another wide viewing angle mode. Figure 1 As shown, a suitable voltage difference (e.g., 2V) is applied between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, so that the liquid crystal molecules in the first liquid crystal layer 13 are deflected to a tilted vertical state, and the display panel realizes a narrow viewing angle mode with a wide viewing angle and light collection. Thus, the voltage on the first viewing angle control electrode 111 and the second viewing angle control electrode 121 is used to switch between a wide viewing angle and a narrow viewing angle. Figure 2is a curve diagram showing the change in transmittance with the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 when the viewing polar angle (polar angle is the angle between the viewing direction and the perpendicular line of the display panel, for example, when the viewing direction is perpendicular to the display panel, the polar angle is 0°) is 45°, wherein Figure 2 It can be seen that when the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 changes from 0 to 5V, the transmittance at the viewing angle of 45° first decreases, reaches the lowest value when the voltage difference is 2V, and then increases, and the narrow viewing angle effect is best when the voltage difference is 2V. However, this dimming box 10 has a poor light collection effect, and usually needs to be matched with a light-collecting backlight module 40. The light-collecting backlight module 40 usually consists of a light source 41, a brightness enhancement film 42, and an anti-peep film 43, which is costly and will also result in a poor effect of the display panel at a wide viewing angle.

[0004] In order to solve the problem of poor light collection effect of monotonous light box and avoid affecting the wide viewing angle effect. Figure 3 As shown, another prior art adopts two dimming boxes 10, so that a good narrow viewing angle effect can be achieved by adopting a common diffuser backlight module 40, and the wide viewing angle effect will not be affected. Specifically, two dimming boxes 20 and a fourth polarizer 34 are added on the basis of the display liquid crystal box 20, and the light transmission axes of the first polarizer 31, the third polarizer 33 and the fourth polarizer 34 are parallel to each other. The alignment directions of the first liquid crystal layer 13 in the two dimming boxes 20 are parallel to each other, and are parallel to the light transmission axes of the first polarizer 31, the third polarizer 33 and the fourth polarizer 34. Figure 4 This is a narrow viewing angle effect diagram of a single dimming box 10. Figure 5 This is a diagram of the narrow viewing angle effect after the two dimming boxes 10 are superimposed, wherein the narrow viewing angle effect of the display panel is the superposition of the narrow viewing angle effects of the two dimming boxes 10, so the light collection effect at a narrow viewing angle is better. Among them, the left and right directions of a single dimming box have a 45° polar angle / center brightness of 9.85%, while after the two dimming boxes are superimposed, the left and right directions have a 45° polar angle / center brightness of 0.97%, and the light collection effect at a narrow viewing angle is better. The following Table 1 compares the wide viewing angle and narrow viewing angle effects of a single dimming box and a double dimming box. It can be seen from the following Table 1 that the narrow viewing angle effect of the double dimming box is equivalent to that of the single dimming box, but there is no need to use a light-collecting backlight module 40; however, the wide viewing angle effect of the double dimming box is better than that of the single dimming box.

[0005]

[0006] However, the display panel using the dual dimming box is a three-box structure, which has high assembly requirements and a large module thickness. It also requires four polarizers, which is a large number and has poor light transmittance. Therefore, the use of the dual dimming box is not the best choice. Summary of the invention

[0007] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a display panel and a driving method, and a display device to solve the problem in the prior art of how to improve the wide viewing angle effect without increasing the module thickness and the number of polarizers.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The present invention provides a display panel, comprising a dimming box and a display liquid crystal box which are stacked on each other, a first polarizer is arranged between the dimming box and the display liquid crystal box, a second polarizer is arranged on a side of the display liquid crystal box away from the dimming box, and a light transmission axis of the first polarizer is perpendicular to a light transmission axis of the second polarizer;

[0010] The dimming box includes 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, the first substrate is provided with a first viewing angle control electrode on a side facing the first liquid crystal layer, the second substrate is provided with a second viewing angle control electrode and a third viewing angle control electrode matched with the first viewing angle control electrode on a side facing the first liquid crystal layer, the second viewing angle control electrode includes a plurality of first electrode strips, the third viewing angle control electrode includes a plurality of second electrode strips, and the projections of the first electrode strips and the second electrode strips on the second substrate are parallel to each other and arranged alternately;

[0011] In the narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer are in a lying posture or a standing posture; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode and the second viewing angle control electrode, there is a second pressure difference between the first viewing angle control electrode and the third viewing angle control electrode, and there is a third pressure difference between the second viewing angle control electrode and the third viewing angle control electrode, the first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to a second preset value, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state and scatter light.

[0012] Further, a first alignment layer is provided on a side of the first substrate facing the first liquid crystal layer, a first alignment pretilt angle of the first alignment layer is between 0 and 90°, and a first angle between a projection of a first alignment direction of the first alignment layer on the second substrate and the first electrode strip is between 0 and 20°;

[0013] A second alignment layer is provided on the side of the second substrate facing the first liquid crystal layer, a second alignment pretilt angle of the second alignment layer is between 0 and 90°, and a second angle between a projection of a second alignment direction of the second alignment layer on the second substrate and the first electrode strip is between 0 and 20°.

[0014] Furthermore, the first liquid crystal layer adopts positive liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 0 and 7°, and the second alignment pretilt angle of the second alignment layer is between 0 and 7°; or the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 83° and 90°.

[0015] Furthermore, the first liquid crystal layer uses positive liquid crystal molecules or negative liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°.

[0016] The present application also provides a method for driving a display panel, for driving the display panel as described above, the driving method comprising:

[0017] Applying a first voltage signal to the first viewing angle control electrode, applying a second voltage signal to the second viewing angle control electrode, and applying a third voltage signal to the third viewing angle control electrode;

[0018] In the narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer are controlled to be in a lying posture or a standing posture; in the wide viewing angle mode, there is a first voltage difference between the first voltage signal and the second voltage signal, there is a second voltage difference between the first voltage signal and the third voltage signal, there is a third voltage difference between the second voltage signal and the third voltage signal, the first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to a second preset value, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state and scatter light.

[0019] Further, the first liquid crystal layer adopts positive liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 0 and 7°, and the second alignment pretilt angle of the second alignment layer is between 0 and 7°; or the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 83° and 90°;

[0020] The driving method includes: in a narrow viewing angle mode, the first voltage signal, the second voltage signal and the third voltage signal are all DC common voltage signals, so that the positive liquid crystal molecules in the first liquid crystal layer maintain an initial posture.

[0021] Further, the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°;

[0022] The first liquid crystal layer uses positive liquid crystal molecules, and the driving method includes: in a narrow viewing angle mode, there is a fourth voltage difference between the first voltage signal and the second voltage signal, and between the first voltage signal and the third voltage signal, and the fourth voltage difference is greater than or equal to a third preset value, so that the positive liquid crystal molecules in the first liquid crystal layer are in a standing posture;

[0023] Alternatively, the first liquid crystal layer uses negative liquid crystal molecules, and the driving method includes: in a narrow viewing angle mode, there is a fourth voltage difference between the first voltage signal and the second voltage signal, and between the first voltage signal and the third voltage signal, and the fourth voltage difference is greater than or equal to a third preset value, so that the negative liquid crystal molecules in the first liquid crystal layer are in a lying position.

[0024] Further, in the wide viewing angle mode, the first voltage signal is a DC common voltage signal, the second voltage signal is a first AC voltage signal that fluctuates up and down around the DC common voltage signal, the third voltage signal is a second AC voltage signal that fluctuates up and down around the DC common voltage signal, and the first AC voltage signal and the second AC voltage signal have different amplitudes and the same period;

[0025] At the same time, the polarities of the first AC voltage signal and the second AC voltage signal are opposite; or, the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their cycles.

[0026] The present application also provides a display panel, comprising a dimming box and a display liquid crystal box which are stacked on each other, a first polarizer is arranged between the dimming box and the display liquid crystal box, a second polarizer is arranged on a side of the display liquid crystal box away from the dimming box, and a light transmission axis of the first polarizer is perpendicular to a light transmission axis of the second polarizer;

[0027] 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, the second substrate is provided with a second viewing angle control electrode and a third viewing angle control electrode which cooperate with each other on a side facing the first liquid crystal layer, the second viewing angle control electrode comprises a plurality of first electrode strips, the third viewing angle control electrode comprises a plurality of second electrode strips, and the projections of the first electrode strips and the second electrode strips on the second substrate are parallel to each other and arranged alternately;

[0028] The first liquid crystal layer uses negative liquid crystal molecules, a first alignment layer is provided on a side of the first substrate facing the first liquid crystal layer, a first alignment pretilt angle of the first alignment layer is between 83° and 90°, a first angle between a projection of a first alignment direction of the first alignment layer on the second substrate and the first electrode strip is between 0° and 20°, a second alignment layer is provided on a side of the second substrate facing the first liquid crystal layer, a second alignment pretilt angle of the second alignment layer is between 83° and 90°, and a second angle between a projection of the second alignment direction of the second alignment layer on the second substrate and the first electrode strip is between 0° and 20°;

[0029] In the narrow viewing angle mode, the negative liquid crystal molecules in the first liquid crystal layer are in a standing posture; in the wide viewing angle mode, there is a fifth voltage difference between the second viewing angle control electrode and the third viewing angle control electrode, and the fifth voltage difference is greater than or equal to a fourth preset value, so that the negative liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state and scatter light.

[0030] The present application also provides a method for driving a display panel, for driving the display panel as described above, the driving method comprising:

[0031] In the narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer are controlled to maintain an initial standing posture; in the wide viewing angle mode, a second voltage signal is applied to the second viewing angle control electrode, and a third voltage signal is applied to the third viewing angle control electrode, and there is a fifth voltage difference between the second voltage signal and the third voltage signal, and the fifth voltage difference is greater than or equal to a fourth preset value, so that the negative liquid crystal molecules in the first liquid crystal layer are in a disordered scattered state and scatter light;

[0032] The second voltage signal is a first AC voltage signal that fluctuates up and down around the DC common voltage signal, and the third voltage signal is a second AC voltage signal that fluctuates up and down around the DC common voltage signal. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period.

[0033] At the same time, the polarities of the first AC voltage signal and the second AC voltage signal are opposite; or, the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their cycles.

[0034] The present application also provides a display device, comprising the display panel as described above.

[0035] The beneficial effects of the present invention are as follows: a first viewing angle control electrode is provided on a side of the first substrate of the dimming box facing the first liquid crystal layer, a second viewing angle control electrode and a third viewing angle control electrode are provided on a side of the second substrate of the dimming box facing the first liquid crystal layer, the second viewing angle control electrode includes a plurality of first electrode strips, the third viewing angle control electrode includes a plurality of second electrode strips, the projections of the first electrode strips and the second electrode strips on the second substrate are parallel to each other and arranged alternately, in a narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer are in a lying posture or a standing posture; in a wide viewing angle mode, a first pressure difference is provided between the first viewing angle control electrode and the second viewing angle control electrode, a second pressure difference is provided between the first viewing angle control electrode and the third viewing angle control electrode, a third pressure difference is provided between the second viewing angle control electrode and the third viewing angle control electrode, the first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state and scatter light. In the wide viewing angle mode, by applying corresponding viewing angle control voltages to the first viewing angle control electrode, the second viewing angle control electrode and the third viewing angle control electrode, the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state, thereby scattering light, and a wide viewing angle effect with a wider viewing angle range can be achieved even when a single dimming light box is used; moreover, the dimming box does not need to be used in conjunction with a polarizer, which greatly reduces the module thickness and the number of polarizers to increase the transmittance of light. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the display device in the first prior art at a narrow viewing angle;

[0037] Figure 2 It is a curve diagram of the first prior art in which the transmittance of the display panel changes with the voltage difference between the first viewing angle control electrode and the second viewing angle control electrode when the viewing angle is 45°;

[0038] Figure 3 is a schematic structural diagram of a display device in a second prior art at a wide viewing angle;

[0039] Figure 4 is a simulation schematic diagram of a single dimming box in a second prior art at a narrow viewing angle;

[0040] Figure 5 is a simulation schematic diagram of a display device in a second prior art at a narrow viewing angle;

[0041] Figure 6 is a schematic structural diagram of a display device in a first embodiment of the present invention at a narrow viewing angle;

[0042] Figure 7 is a waveform diagram of a viewing angle control signal of a display device at a narrow viewing angle in the first embodiment of the present invention;

[0043] Figure 8 is a schematic diagram of the planar structure of the second viewing angle control electrode and the third viewing angle control electrode in the first embodiment of the present invention;

[0044] Fig. 9 is a schematic structural diagram of a display device in a first embodiment of the present invention at a wide viewing angle;

[0045] Fig.10 is a waveform diagram of a viewing angle control signal of a display device at a wide viewing angle in the first embodiment of the present invention;

[0046] Fig.11 is a waveform diagram of a viewing angle control signal of a display device at a wide viewing angle in the second embodiment of the present invention;

[0047] Fig.12 is a schematic diagram of the structure of the display device in Embodiment 3 of the present invention at a narrow viewing angle;

[0048] Fig.13 is a schematic structural diagram of a display device in a fourth embodiment of the present invention at a narrow viewing angle;

[0049] Fig.14 is a schematic structural diagram of a display device in a fourth embodiment of the present invention at a wide viewing angle;

[0050] Fig.15 is a waveform diagram of a viewing angle control signal of a display device at a wide viewing angle in a fourth embodiment of the present invention;

[0051] Fig.16 is a schematic structural diagram of a display device in an initial state in Embodiment 5 of the present invention;

[0052] Fig.17 is a schematic diagram of the structure of the display device in Embodiment 5 of the present invention at a narrow viewing angle;

[0053] Fig.18 is a waveform diagram of a viewing angle control signal of a display device at a narrow viewing angle in Embodiment 5 of the present invention;

[0054] Fig.19 is a schematic diagram of the structure of the display device in Embodiment 5 of the present invention at a wide viewing angle;

[0055] Fig. 20 is a schematic diagram of the structure of the display device in Embodiment 6 of the present invention at a narrow viewing angle;

[0056] Fig.21 It is one of the planar structural schematic diagrams of the display device in the present invention;

[0057] Fig. 22 This is the second schematic diagram of the planar structure of the display device in the present invention. DETAILED DESCRIPTION

[0058] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the display panel and driving method, and the display device proposed according to the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0059] [Example 1]

[0060] Figure 6 It is a schematic diagram of the structure of the display device in the first embodiment of the present invention at a narrow viewing angle. Figure 8 FIG. 1 is a schematic diagram of the planar structure of the second viewing angle control electrode and the third viewing angle control electrode in the first embodiment of the present invention. Figure 6 and Figure 8 As shown, a display panel provided by the first embodiment of the present invention includes a dimming box 10 and a display liquid crystal box 20 which are stacked on each other. In this embodiment, the dimming box 10 and the display liquid crystal box 20 are both one, and the dimming box 10 is arranged below the display liquid crystal box 20, that is, the dimming box 10 is arranged between the display liquid crystal box 20 and the backlight module 40. The dimming box 10 is used to control the viewing angle of the display device, and the display liquid crystal box 20 is used to control the display device to display a normal picture. Of course, the dimming box 10 can also be arranged above the display liquid crystal box 20, that is, the dimming box 10 is arranged on the light-emitting side of the display liquid crystal box 20.

[0061] A first polarizer 31 is disposed between the dimming box 10 and the display liquid crystal box 20, and a second polarizer 32 is disposed on the side of the display liquid crystal box 20 away from the dimming box 10, and the light transmission axis of the first polarizer 31 and the light transmission axis of the second polarizer 32 are perpendicular to each other. There is no polarizer or other polarizing film on the side of the dimming box 10 away from the display liquid crystal box 20.

[0062] The dimming box 10 includes a first substrate 11, a second substrate 12 arranged opposite to the first substrate 11, and a first liquid crystal layer 13 arranged between the first substrate 11 and the second substrate 12. The first substrate 11 is provided with a first viewing angle control electrode 111 on the side facing the first liquid crystal layer 13, and the second substrate 12 is provided with a second viewing angle control electrode 121 and a third viewing angle control electrode 122 cooperating with the first viewing angle control electrode 111 on the side facing the first liquid crystal layer 13, the second viewing angle control electrode 121 includes a plurality of first electrode strips 121a, and the third viewing angle control electrode 122 includes a plurality of second electrode strips 122a, and the projections of the first electrode strips 121a and the second electrode strips 122a on the second substrate 12 are parallel to each other and arranged alternately. In this embodiment, the first viewing angle control electrode 111 is a planar electrode covering the entire surface of the first substrate 11, and the second viewing angle control electrode 121 and the third viewing angle control electrode 122 are comb-shaped electrodes covering the entire surface of the second substrate 12, that is, the second viewing angle control electrode 121 and the third viewing angle control electrode 122 cover the entire surface of the second substrate 12 without interruption.

[0063] In this embodiment, the first liquid crystal layer 13 is a positive liquid crystal molecule, that is, a liquid crystal molecule with positive dielectric anisotropy, wherein △n=ne-no of the positive liquid crystal molecule, the larger the △n, the more favorable it is for astigmatism at a wide viewing angle, preferably △n=0.25; positive liquid crystal molecules with a retardation greater than 300nm. In the initial state, the first liquid crystal layer 13 is in a lying posture, that is, the positive liquid crystal molecules in the first liquid crystal layer 13 are aligned parallel to the first substrate 10 and the second substrate 20, and the alignment direction of the positive liquid crystal molecules close to the first substrate 10 is antiparallel to the positive liquid crystal molecules close to the second substrate 20. In the narrow viewing angle mode, the positive liquid crystal molecules in the first liquid crystal layer 13 are in a lying position; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a second pressure difference between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a third pressure difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. The first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state (for example, the long axis directions of the liquid crystal molecules in the positive direction, left side and right side of the first electrode strip 121a are different, and the long axis directions of the liquid crystal molecules in the positive direction, left side and right side of the second electrode strip 122a are different) and scatter light.

[0064] Furthermore, a first alignment layer is provided on the side of the first substrate 11 facing the first liquid crystal layer 13, a first alignment pretilt angle of the first alignment layer is between 0° and 90° (i.e. 0° and 90° are excluded), and a first angle between a projection of the first alignment direction of the first alignment layer on the second substrate 12 and the first electrode strip 121a is between 0° and 20°; a second alignment layer is provided on the side of the second substrate 12 facing the first liquid crystal layer 13, a second alignment pretilt angle of the second alignment layer is between 0° and 90°, and a second angle between a projection of the second alignment direction of the second alignment layer on the second substrate 12 and the first electrode strip 121a is between 0° and 20° (i.e. 0° and 20° are excluded). In this embodiment, the positive liquid crystal molecules may have a smaller pre-tilt angle when initially aligned, that is, the positive liquid crystal molecules initially form a smaller angle with the first substrate 10 and the second substrate 20, the first alignment pre-tilt angle of the first alignment layer is between 0° and 7°, the second alignment pre-tilt angle of the second alignment layer is between 0° and 7°, and the first alignment pre-tilt angle of the first alignment layer is the same as the second alignment pre-tilt angle of the second alignment layer. When switching to a narrow viewing angle, the positive liquid crystal molecules can be deflected toward the vertical direction faster. At the same time, the angle between the alignment direction (the first alignment direction, the second alignment direction) and the first electrode strip 121a is between 0° and 20°, so that the horizontal deflection direction of the positive liquid crystal molecules can be limited to ensure a wide viewing angle effect.

[0065] In this embodiment, the second viewing angle control electrode 121 and the third viewing angle control electrode 122 are located in different layers and are separated from each other by an insulating layer, thereby avoiding the problem of short circuit between the second viewing angle control electrode 121 and the third viewing angle control electrode 122, and at the same time, the gap between the first electrode strip 121a and the second electrode strip 122a can be reduced. The second viewing angle control electrode 121 also includes a first wire 121b, and the first wire 121b conductively connects multiple first electrode strips 121a. The third viewing angle control electrode 122 also includes a second wire 122b, and the second wire 122b conductively connects multiple second electrode strips 122a. The number of the first wire 121b and the second wire 122b is multiple, so as to reduce the resistance of the second viewing angle control electrode 121 and the third viewing angle control electrode 122. The extension direction of the first wire 121b is perpendicular to the extension direction of the first electrode strip 121a, and the extension direction of the second wire 122b is perpendicular to the extension direction of the second electrode strip 122a. Of course, in other embodiments, the second viewing angle control electrode 121 and the third viewing angle control electrode 122 may also be located in the same layer and insulated and isolated. In this case, the first wire 121b and the second wire 122b need to be disposed in the non-display area at the edge of the display panel.

[0066] Further, the width d1 of the first wire 121b is 3-4 μm, the width d2 of the second wire 122b is 3-4 μm, and the spacing h1 between the first wire 121b and the second wire 122b is 15-25 μm. Preferably, the width d1 of the first wire 121b is 3.5 μm, the width d2 of the second wire 122b is 3.5 μm, and the spacing h1 between the first wire 121b and the second wire 122b is 23 μm.

[0067] Further, the width d3 of the first electrode strip 121a is 3-4 μm, the spacing between two adjacent first electrode strips 121a is 5-6 μm, the width d4 of the second electrode strip 122a is 3-4 μm, and the spacing between two adjacent second electrode strips 122a is 5-6 μm. Preferably, the width d3 of the first electrode strip 121a is 3.5 μm, the spacing between two adjacent first electrode strips 121a is 5.5 μm, the width d4 of the second electrode strip 122a is 3.5 μm, and the spacing between two adjacent second electrode strips 122a is 5.5 μm. That is, the first wire 121b has the same width as the first electrode strip 121a, the second wire 122b has the same width as the second electrode strip 122a, and the first electrode strip 121a has the same width as the second electrode strip 122a.

[0068] Further, the projection of the first electrode strip 121a on the plane where the second substrate 12 is located and the projection of the second electrode strip 122a on the plane where the second substrate 12 is located are spaced and arranged alternately. Specifically, the spacing h2 between the projections of the two on the plane where the second substrate 12 is located is 1-2 μm. Preferably, the spacing h2 between the projections of the first electrode strip 121a and the second electrode strip 122a on the plane where the second substrate 12 is located is 1 μm.

[0069] The display liquid crystal box 20 includes a color filter substrate 21, an array substrate 22 disposed opposite to the color filter substrate 21, and a second liquid crystal layer 23 located between the color filter substrate 21 and the array substrate 22. Preferably, positive liquid crystal molecules, i.e., liquid crystal molecules with positive dielectric anisotropy, are used in the second liquid crystal layer 23. In the initial state, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color filter substrate 21 and the array substrate 22, and the alignment direction of the positive liquid crystal molecules close to the color filter substrate 21 is parallel or anti-parallel to the alignment direction of the positive liquid crystal molecules close to the array substrate 22. In other embodiments, the array substrate 22 and the first substrate 11 may share a substrate to reduce the cell thickness of the display panel.

[0070] The color filter substrate 21 is provided with color resist layers 212 arranged in an array and a black matrix 211 separating the color resist layers 212. The color resist layers 212 include color resist materials of red (R), green (G), and blue (B), and correspondingly form sub-pixels of red (R), green (G), and blue (B).

[0071] The array substrate 22 is formed into a plurality of pixel units by a plurality of scan lines and a plurality of data lines which are insulated and crossed from each other on the side facing the second liquid crystal layer 23. A pixel electrode 222 and a thin film transistor are provided in each pixel unit. The pixel electrode 222 is electrically connected to the data line of the adjacent thin film transistor through the thin film transistor. The thin film transistor includes a gate, an active layer, a drain and a source. The gate and the scan line are located in the same layer and are electrically connected. The gate and the active layer are separated by an insulating layer. The source is electrically connected to the data line. The drain is electrically connected to the pixel electrode 222 through a contact hole.

[0072] like Figure 6 As shown, in this embodiment, a common electrode 221 is further provided on the side of the array substrate 22 facing the second liquid crystal layer 23. The common electrode 221 and the pixel electrode 222 are located in different layers and insulated and isolated by an insulating layer. The common electrode 221 can be located above or below the pixel electrode 222 ( Figure 1 As shown in the figure, the common electrode 221 is located below the pixel electrode 222). Preferably, the common electrode 221 is a planar electrode arranged on the entire surface, and the pixel electrode 222 is a block electrode arranged in each pixel unit or a slit electrode having a plurality of electrode strips to form a fringe field switching mode (Fringe Field Switching, FFS). Of course, in other embodiments, the pixel electrode 222 and the common electrode 221 may be located on the same layer, but the two are insulated and isolated from each other, and the pixel electrode 222 and the common electrode 221 may each include a plurality of electrode strips, and the electrode strips of the pixel electrode 222 and the electrode strips of the common electrode 221 are arranged alternately to form an in-plane switching mode (In-Plane Switching, IPS); or, in other embodiments, the array substrate 22 is provided with a pixel electrode 222 on the side facing the second liquid crystal layer 23, and the color filter substrate 21 is provided with a common electrode 221 on the side facing the second liquid crystal layer 23 to form a TN mode or a VA mode. As for other introductions to the TN mode and the VA mode, please refer to the prior art, which will not be repeated here.

[0073] The first substrate 11, the second substrate 12, the color filter substrate 21 and the array substrate 22 may be made of materials such as glass, acrylic and polycarbonate. The materials of the first viewing angle control electrode 111, the second viewing angle control electrode 121 and the third viewing angle control electrode 122, the common electrode 221 and the pixel electrode 222 may be indium tin oxide (ITO) or indium zinc oxide (IZO).

[0074] Furthermore, a backlight module 40 is provided on a side of the dimming box 10 away from the display liquid crystal box 20. Preferably, the backlight module 40 adopts a collimated backlight (CBL) mode, which can collect light and ensure the display effect.

[0075] The backlight module 40 includes a backlight source 41 and an anti-peep layer 43, and the anti-peep layer 43 is used to narrow the range of the light emission angle. A brightness enhancement film 42 is also provided between the backlight source 41 and the anti-peep layer 43, and the brightness enhancement film 42 increases the brightness of the backlight module 40. Among them, the anti-peep layer 43 is equivalent to a miniature shutter structure, which can block light with a larger incident angle and allow light with a smaller incident angle to pass through, so that the angle range of light passing through the anti-peep layer 43 becomes smaller. The anti-peep layer 43 includes a plurality of parallel light-blocking walls and a light-transmitting hole located between two adjacent light-blocking walls, and light-absorbing materials are provided on both sides of the light-blocking wall. The light collection angle of the anti-peep layer 43 is 60°, 100°, etc. The smaller the light collection angle, the better the narrow viewing angle effect. The backlight module 41 can be a side-entry backlight module or a collimated backlight module.

[0076] This embodiment also provides a method for driving a display panel, which is used to drive the display panel as described above. The driving method includes: applying a first voltage signal V1 to the first viewing angle control electrode 111, applying a second voltage signal V2 to the second viewing angle control electrode 121, and applying a third voltage signal V3 to the third viewing angle control electrode 122, and applying corresponding viewing angle control voltages to the first viewing angle control electrode 111, the second viewing angle control electrode 121, and the third viewing angle control electrode 122, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered scattered state, so that the light can be scattered to achieve a wide viewing angle effect; or the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture or a standing posture, and the emission angle of the light is basically not changed, so as to achieve a narrow viewing angle effect.

[0077] Figure 7 : is a waveform diagram of the viewing angle control signal of the display device at a narrow viewing angle in the first embodiment of the present invention. Figure 6 and Figure 7 As shown, in the narrow viewing angle mode, the first voltage signal V1, the second voltage signal V2 and the third voltage signal V3 are all DC common voltage signals, so that the positive liquid crystal molecules in the first liquid crystal layer 13 maintain their initial posture, that is, the liquid crystal molecules in the first liquid crystal layer 13 are controlled to be in the initial flat posture, and the first liquid crystal layer 13 basically does not change the emission angle of the light to achieve a narrow viewing angle effect. Among them, after the light emitted by the backlight source 41 is collected by the anti-peep layer 43, the viewing angle becomes narrower, and the narrow viewing angle effect is better.

[0078] Fig. 9 It is a schematic diagram of the structure of the display device in the first embodiment of the present invention at a wide viewing angle. Fig.10: is a waveform diagram of the viewing angle control signal of the display device at a wide viewing angle in the first embodiment of the present invention. Fig. 9 and Fig.10 As shown, in the wide viewing angle mode, there is a first voltage difference (e.g., 5V) between the first voltage signal V1 and the second voltage signal V2, a second voltage difference (e.g., 10V) between the first voltage signal V1 and the third voltage signal V3, a third voltage difference (e.g., also 15V) between the second voltage signal V2 and the third voltage signal V3, the first voltage difference and the second voltage difference are both greater than a first preset value (e.g., 5V), and the third voltage difference is greater than or equal to a second preset value (e.g., 15V). At this time, a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a strong horizontal electric field is formed between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Under the action of the vertical electric field and the horizontal electric field, and with the alignment pretilt angle (first alignment pretilt angle, second alignment pretilt angle) between 0° and 7°, and the angle between the alignment direction (first alignment direction, second alignment direction) and the first electrode strip 121a between 0° and 20°, the positive liquid crystal molecules can be driven to deflect in the horizontal and vertical directions toward the preset direction, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state, and have a scattering effect on light, so as to achieve a wide viewing angle display.

[0079] Table 2 below shows the simulation data of wide viewing angle and narrow viewing angle in this embodiment:

[0080]

[0081] By comparing Table 1 in the background technology with Table 2 in this embodiment, it can be seen that the display panel of the existing monotone light box has a 45° polar angle brightness / center brightness of 1.12% at a wide viewing angle, while the present application has a 45° polar angle brightness / center brightness of 8.96%, and the wide viewing angle effect is much better than that of the display panel of the existing monotone light box.

[0082] In this embodiment, in the wide viewing angle mode, the first voltage signal V1 is a DC common voltage signal, and the second voltage signal V2 is a first AC voltage signal that fluctuates up and down around the DC common voltage signal. For example, the second voltage signal V2 is a 5V AC voltage that fluctuates up and down around the DC common voltage signal; the third voltage signal V3 is a second AC voltage signal that fluctuates up and down around the DC common voltage signal, and the third voltage signal V3 is a 10V AC voltage that fluctuates up and down around the DC common voltage signal. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period, and at the same time, the polarities of the first AC voltage signal and the second AC voltage signal are opposite. Of course, the amplitudes of the second voltage signal V2 and the third voltage signal V3 can be adjusted according to actual needs.

[0083] [Example 2]

[0084] Fig.11 : is a waveform diagram of a viewing angle control signal of a display device in a second embodiment of the present invention at a wide viewing angle. The display panel and driving method provided in the second embodiment of the present invention are similar to those in the first embodiment ( Figures 6 to 10 ) are substantially the same, except that, in this embodiment:

[0085] The driving method includes: applying a first voltage signal V1 to the first viewing angle control electrode 111, applying a second voltage signal V2 to the second viewing angle control electrode 121, and applying a third voltage signal V3 to the third viewing angle control electrode 122. By applying corresponding viewing angle control voltages to the first viewing angle control electrode 111, the second viewing angle control electrode 121, and the third viewing angle control electrode 122, the liquid crystal molecules in the first liquid crystal layer are in a disordered and scattered state, so that light can be scattered to achieve a wide viewing angle effect; or the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture or a standing posture, basically without changing the emission angle of the light, to achieve a narrow viewing angle effect.

[0086] In the narrow viewing angle mode, the first voltage signal V1, the second voltage signal V2 and the third voltage signal V3 are all DC common voltage signals, which keep the positive liquid crystal molecules in the first liquid crystal layer 13 in their initial posture, that is, control the liquid crystal molecules in the first liquid crystal layer 13 to be in their initial flat posture, and the first liquid crystal layer 13 basically does not change the emission angle of the light, so as to achieve a narrow viewing angle effect. Among them, after the light emitted by the backlight source 41 is collected by the anti-peep layer 43, the viewing angle becomes narrower, and the narrow viewing angle effect is better.

[0087] like Fig.11As shown, in the wide viewing angle mode, there is a first voltage difference (e.g., 5V) between the first voltage signal V1 and the second voltage signal V2, a second voltage difference (e.g., 10V) between the first voltage signal V1 and the third voltage signal V3, a third voltage difference (e.g., also 15V) between the second voltage signal V2 and the third voltage signal V3, the first voltage difference and the second voltage difference are both greater than a first preset value (e.g., 5V), and the third voltage difference is greater than or equal to a second preset value (e.g., 15V). At this time, a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a strong horizontal electric field is formed between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Under the action of the vertical electric field and the horizontal electric field, with the alignment pre-tilt angle (the first alignment pre-tilt angle, the second alignment pre-tilt angle) between 0° and 7°, and the angle between the alignment direction (the first alignment direction, the second alignment direction) and the first electrode strip 121a between 0° and 20°, the positive liquid crystal molecules can be driven to deflect in the horizontal and vertical directions toward the preset direction, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered scattered state and have a scattering effect on light, so as to achieve a wide viewing angle display.

[0088] In this embodiment, in the wide viewing angle mode, the first voltage signal V1 is a DC common voltage signal, and the second voltage signal V2 is a first AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, for example, the second voltage signal V2 is a 5V AC voltage that fluctuates up and down with the DC common voltage signal as the center; the third voltage signal V3 is a second AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, and the third voltage signal V3 is a 10V AC voltage that fluctuates up and down with the DC common voltage signal as the center. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period, but the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their periods.

[0089] like Fig.11 As shown, in the time period t1 and the time period t2 of T / 2, the voltage difference between the second voltage signal V2 and the third voltage signal V3 is different, so that the voltage difference between the second voltage signal V2 and the third voltage signal V3 changes multiple times in each frame, thereby ensuring a wide viewing angle effect while avoiding the polarization problem of positive liquid crystal molecules.

[0090] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0091] [Example 3]

[0092] Fig.12Schematic diagram of the structure of the display device in the third embodiment of the present invention at a narrow viewing angle. Fig.12 As shown, the display panel and driving method provided in the third embodiment of the present invention are similar to those provided in the first embodiment ( Figures 6 to 10 )、Example 2 ( Fig.11 ) are substantially the same, except that, in this embodiment:

[0093] In this embodiment, the first liquid crystal layer 13 is a positive liquid crystal molecule, that is, a liquid crystal molecule with positive dielectric anisotropy, wherein Δn=ne-no of the positive liquid crystal molecule, the larger the Δn, the more favorable it is for light dispersion at a wide viewing angle, preferably, Δn=0.25; positive liquid crystal molecules with a retardation greater than 300nm are used. In the initial state, the first liquid crystal layer 13 is in a standing posture, that is, the positive liquid crystal molecules in the first liquid crystal layer 13 are aligned approximately perpendicular to the first substrate 10 and the second substrate 20. In the narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer 13 are in a standing posture; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a second pressure difference between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a third pressure difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Both the first pressure difference and the second pressure difference are greater than the first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state and scatter light.

[0094] Furthermore, a first alignment layer is provided on the side of the first substrate 11 facing the first liquid crystal layer 13, a first alignment pretilt angle of the first alignment layer is between 0° and 90° (i.e. 0° and 90° are excluded), and a first angle between a projection of the first alignment direction of the first alignment layer on the second substrate 12 and the first electrode strip 121a is between 0° and 20°; a second alignment layer is provided on the side of the second substrate 12 facing the first liquid crystal layer 13, a second alignment pretilt angle of the second alignment layer is between 0° and 90°, and a second angle between a projection of the second alignment direction of the second alignment layer on the second substrate 12 and the first electrode strip 121a is between 0° and 20° (i.e. 0° and 20° are excluded).

[0095] In this embodiment, the positive liquid crystal molecules have a large pre-tilt angle when initially aligned, that is, the positive liquid crystal molecules initially form a large angle with the first substrate 10 and the second substrate 20, the first alignment pre-tilt angle of the first alignment layer is between 83° and 90°, the second alignment pre-tilt angle of the second alignment layer is between 83° and 90°, and the first alignment pre-tilt angle of the first alignment layer is the same as the second alignment pre-tilt angle of the second alignment layer. When switching to a narrow viewing angle, the positive liquid crystal molecules can be accelerated to deflect toward the horizontal direction. At the same time, the angle between the alignment direction (the first alignment direction, the second alignment direction) and the first electrode strip 121a is between 0° and 20°, so that the horizontal deflection direction of the positive liquid crystal molecules can be limited to ensure a wide viewing angle effect. If the first alignment pretilt angle of the first alignment layer is 90° and the second alignment pretilt angle of the second alignment layer is 90°, the projection of the positive liquid crystal molecules on the second substrate 12 is a point. When voltage is applied, the positive liquid crystal molecules cannot be deflected in the set direction in the horizontal direction, the deflection in the horizontal direction is relatively chaotic, and the display uniformity is poor.

[0096] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be described in detail here.

[0097] [Example 4]

[0098] Fig.13 It is a schematic diagram of the structure of the display device in the fourth embodiment of the present invention at a narrow viewing angle. Fig.14 It is a schematic diagram of the structure of the display device in the fourth embodiment of the present invention at a wide viewing angle. Fig.15 : is a waveform diagram of the viewing angle control signal of the display device at a wide viewing angle in the fourth embodiment of the present invention. Figures 13 to 15 As shown, the display panel and driving method provided by the fourth embodiment of the present invention are similar to those provided by the first embodiment ( Figures 6 to 10 )、Example 2 ( Fig.11 ) are substantially the same, except that, in this embodiment:

[0099] The first liquid crystal layer 13 uses negative liquid crystal molecules, that is, liquid crystal molecules with negative dielectric anisotropy. In the initial state, the first liquid crystal layer 13 is in a standing posture, that is, the negative liquid crystal molecules in the first liquid crystal layer 13 are aligned perpendicular to the first substrate 10 and the second substrate 20. In the narrow viewing angle mode, the negative liquid crystal molecules in the first liquid crystal layer 13 are in a standing posture; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a second pressure difference between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a third pressure difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. The first pressure difference and the second pressure difference are both greater than the first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the negative liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state and scatter light.

[0100] The negative liquid crystal molecules have a large pre-tilt angle when initially aligned, that is, the negative liquid crystal molecules initially form a large angle with the first substrate 10 and the second substrate 20. A first alignment layer is provided on the side of the first substrate 11 facing the first liquid crystal layer 13, and the first alignment pre-tilt angle of the first alignment layer is between 83° and 90°. A second alignment layer is provided on the side of the second substrate 12 facing the first liquid crystal layer 13, and the second alignment pre-tilt angle of the second alignment layer is between 83° and 90°. The first alignment pre-tilt angle of the first alignment layer is the same as the second alignment pre-tilt angle of the second alignment layer. Since negative liquid crystal molecules are used in this embodiment, and the negative liquid crystal molecules in the first liquid crystal layer 13 are aligned substantially perpendicular to the first substrate 10 and the second substrate 20, it is not necessary to provide the first viewing angle control electrode 111 on the first substrate 11, and it is not necessary to form a vertical electric field at a wide viewing angle, thereby reducing the cell thickness and driving power consumption.

[0101] This embodiment also provides a method for driving a display panel, which is used to drive the display panel as described above. The driving method includes: applying a second voltage signal V2 to the second viewing angle control electrode 121, and applying a third voltage signal V3 to the third viewing angle control electrode 122, and applying corresponding viewing angle control voltages to the second viewing angle control electrode 121 and the third viewing angle control electrode 122, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered scattered state, so that the light can be scattered to achieve a wide viewing angle effect; or the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture or a standing posture, and the emission angle of the light is basically not changed, so as to achieve a narrow viewing angle effect.

[0102] like Fig.13As shown, in the narrow viewing angle mode, the second voltage signal V2 and the third voltage signal V3 are both DC common voltage signals, and the negative liquid crystal molecules in the first liquid crystal layer 13 are in a standing posture, that is, the liquid crystal molecules in the first liquid crystal layer 13 are controlled to be in an initial standing posture, and the first liquid crystal layer 13 basically does not change the emission angle of the light to achieve a narrow viewing angle effect. Among them, after the light emitted by the backlight source 41 is collected by the anti-peep layer 43, the viewing angle becomes narrower, and the narrow viewing angle effect is better.

[0103] like Fig.14 and Fig.15 As shown, in the wide viewing angle mode, there is a fifth voltage difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122, and the fifth voltage difference is greater than or equal to the fourth preset value, so that the negative liquid crystal molecules in the first liquid crystal layer 13 are in a disordered scattered state and scatter light. Specifically, a second voltage signal V2 is applied to the second viewing angle control electrode 121, and a third voltage signal V3 is applied to the third viewing angle control electrode 122. There is a fifth voltage difference (for example, also 15V) between the second voltage signal V2 and the third voltage signal V3. The fifth voltage difference is greater than or equal to a fourth preset value (for example, 15V). A strong horizontal electric field is formed between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Under the action of the horizontal electric field, and in combination with an alignment pretilt angle (a first alignment pretilt angle, a second alignment pretilt angle) between 83° and 90°, and an angle between the alignment direction (a first alignment direction, a second alignment direction) and the first electrode strip 121a between 0° and 20°, the negative liquid crystal molecules can be driven to deflect in the horizontal direction toward the preset direction, so that the negative liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state, and have a scattering effect on light, so as to achieve a wide viewing angle display.

[0104] In this embodiment, in the wide viewing angle mode, the second voltage signal V2 is a first AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, for example, the second voltage signal V2 is a 5V AC voltage that fluctuates up and down with the DC common voltage signal as the center; the third voltage signal V3 is a second AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, and the third voltage signal V3 is a 10V AC voltage that fluctuates up and down with the DC common voltage signal as the center. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period, but the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their periods.

[0105] like Fig.15As shown, in the time period t1 and the time period t2 of T / 2, the voltage difference between the second voltage signal V2 and the third voltage signal V3 is different, so that the voltage difference between the second voltage signal V2 and the third voltage signal V3 changes multiple times in each frame, thereby ensuring a wide viewing angle effect while avoiding the polarization problem of positive liquid crystal molecules.

[0106] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be described in detail here.

[0107] [Example 5]

[0108] Fig.16 Schematic diagram of the structure of the display device in the initial state in the fifth embodiment of the present invention. Fig.16 As shown, the display panel and driving method provided in the fifth embodiment of the present invention are similar to those in the first embodiment ( Figures 6 to 10 )、Example 2 ( Fig.11 ) are substantially the same, except that, in this embodiment:

[0109] The first liquid crystal layer 13 is a positive liquid crystal molecule, that is, a liquid crystal molecule with positive dielectric anisotropy, wherein △n=ne-no of the positive liquid crystal molecule, the larger △n is, the more favorable it is for astigmatism at a wide viewing angle, preferably △n=0.25; positive liquid crystal molecules with a retardation greater than 300nm. The first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°, that is, the positive liquid crystal molecules close to the first substrate 10 are aligned approximately perpendicular to the first substrate 10, and the positive liquid crystal molecules close to the second substrate 20 are aligned approximately perpendicular to the second substrate 20, thereby reducing the driving power consumption at a wide viewing angle. In the narrow viewing angle mode, the positive liquid crystal molecules in the first liquid crystal layer 13 are in a standing posture; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a second pressure difference between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a third pressure difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Both the first pressure difference and the second pressure difference are greater than the first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state and scatter light.

[0110] This embodiment also provides a method for driving a display panel, which is used to drive the display panel as described above. The driving method includes: applying a first voltage signal V1 to the first viewing angle control electrode 111, applying a second voltage signal V2 to the second viewing angle control electrode 121, and applying a third voltage signal V3 to the third viewing angle control electrode 122, and applying corresponding viewing angle control voltages to the first viewing angle control electrode 111, the second viewing angle control electrode 121, and the third viewing angle control electrode 122, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered scattered state, so that the light can be scattered to achieve a wide viewing angle effect; or the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture or a standing posture, and the emission angle of the light is basically not changed, so as to achieve a narrow viewing angle effect.

[0111] Fig.17 It is a schematic diagram of the structure of the display device in the fifth embodiment of the present invention at a narrow viewing angle. Fig.18 : is a waveform diagram of the viewing angle control signal of the display device in the fifth embodiment of the present invention when the viewing angle is narrow. Fig.17 and Fig.18 As shown, in the narrow viewing angle mode, there is a fourth voltage difference (e.g., 5V) between the first voltage signal V1 and the second voltage signal V2, and between the first voltage signal V1 and the third voltage signal V3, and the fourth voltage difference is greater than or equal to the third preset value (e.g., 5V). A strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, so that the positive liquid crystal molecules close to the second substrate 20 are deflected in the vertical direction and stand in a posture, and the first liquid crystal layer 13 basically does not change the emission angle of the light, so as to achieve a narrow viewing angle effect. Among them, after the light emitted by the backlight source 41 is collected by the anti-peep layer 43, the viewing angle becomes narrower, and the narrow viewing angle effect is better.

[0112] Fig.19 Schematic diagram of the structure of the display device in the fifth embodiment of the present invention at a wide viewing angle. Fig. 9 and Fig.10As shown, in the wide viewing angle mode, there is a first voltage difference (for example, 3.5V) between the first voltage signal V1 and the second voltage signal V2, a second voltage difference (for example, 7.5V) between the first voltage signal V1 and the third voltage signal V3, a third voltage difference (for example, also 11V) between the second voltage signal V2 and the third voltage signal V3, the first voltage difference and the second voltage difference are both greater than a first preset value (for example, 3V), and the third voltage difference is greater than or equal to a second preset value (for example, 7V). At this time, a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a strong horizontal electric field is formed between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Under the action of the vertical electric field and the horizontal electric field, and with the alignment pretilt angle (first alignment pretilt angle, second alignment pretilt angle) between 0° and 7°, and the angle between the alignment direction (first alignment direction, second alignment direction) and the first electrode strip 121a between 0° and 20°, the positive liquid crystal molecules can be driven to deflect in the horizontal and vertical directions toward the preset direction, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state, and have a scattering effect on light, so as to achieve a wide viewing angle display.

[0113] Of course, in another embodiment, Fig.11 As shown, in the wide viewing angle mode, the first voltage signal V1 is a DC common voltage signal, and the second voltage signal V2 is a first AC voltage signal that fluctuates up and down with the DC common voltage signal as the center. For example, the second voltage signal V2 is a 5V AC voltage that fluctuates up and down with the DC common voltage signal as the center; the third voltage signal V3 is a second AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, and the third voltage signal V3 is a 10V AC voltage that fluctuates up and down with the DC common voltage signal as the center. Among them, the amplitudes of the first AC voltage signal and the second AC voltage signal are different, and the periods are the same, but the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their periods. Among them, in the t1 time period and the t2 time period of T / 2, the voltage difference between the second voltage signal V2 and the third voltage signal V3 is different, so that the voltage difference between the second voltage signal V2 and the third voltage signal V3 in each frame changes multiple times, ensuring the wide viewing angle effect while avoiding the problem of polarization of positive liquid crystal molecules.

[0114] In this embodiment, since the positive liquid crystal molecules on the side close to the first substrate 10 are aligned approximately perpendicular to the first substrate 10, and the positive liquid crystal molecules on the side close to the second substrate 20 are aligned approximately perpendicular to the second substrate 20, the driving power consumption at a wide viewing angle can be reduced.

[0115] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be described in detail here.

[0116] [Example 6]

[0117] Fig. 20 Schematic diagram of the structure of the display device in Embodiment 6 of the present invention at a narrow viewing angle. Fig. 20 As shown, the display panel and driving method provided in the sixth embodiment of the present invention are similar to those provided in the fifth embodiment ( Figures 16 to 19 ) are substantially the same, except that, in this embodiment:

[0118] The first liquid crystal layer 13 uses negative liquid crystal molecules, that is, liquid crystal molecules with negative dielectric anisotropy. The first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°, that is, the negative liquid crystal molecules on the side close to the first substrate 10 are aligned approximately perpendicular to the first substrate 10, and the negative liquid crystal molecules on the side close to the second substrate 20 are aligned approximately perpendicular to the second substrate 20, thereby reducing the driving power consumption at a wide viewing angle. In the narrow viewing angle mode, the negative liquid crystal molecules in the first liquid crystal layer 13 are in a lying position; in the wide viewing angle mode, there is a first pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, there is a second pressure difference between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, there is a third pressure difference between the second viewing angle control electrode 121 and the third viewing angle control electrode 122, the first pressure difference and the second pressure difference are both greater than the first preset value, and the third pressure difference is greater than or equal to the second preset value, so that the negative liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state and scatter light.

[0119] This embodiment also provides a method for driving a display panel, which is used to drive the display panel as described above. The driving method includes: applying a first voltage signal V1 to the first viewing angle control electrode 111, applying a second voltage signal V2 to the second viewing angle control electrode 121, and applying a third voltage signal V3 to the third viewing angle control electrode 122, and applying corresponding viewing angle control voltages to the first viewing angle control electrode 111, the second viewing angle control electrode 121, and the third viewing angle control electrode 122, so that the liquid crystal molecules in the first liquid crystal layer are in a disordered scattered state, so that the light can be scattered to achieve a wide viewing angle effect; or the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture or a standing posture, and the emission angle of the light is basically not changed, so as to achieve a narrow viewing angle effect.

[0120] In the narrow viewing angle mode, there is a fourth voltage difference (for example, 5V) between the first voltage signal V1 and the second voltage signal V2, and between the first voltage signal V1 and the third voltage signal V3, and the fourth voltage difference is greater than or equal to the third preset value. A strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, so that the negative liquid crystal molecules close to the first substrate 10 are deflected in the vertical direction and lie flat, and the first liquid crystal layer 13 basically does not change the emission angle of the light, so as to achieve a narrow viewing angle effect. Among them, after the light emitted by the backlight source 41 is collected by the anti-peep layer 43, the viewing angle becomes narrower, and the narrow viewing angle effect is better.

[0121] In the wide viewing angle mode, there is a first voltage difference (e.g., 3.5V) between the first voltage signal V1 and the second voltage signal V2, a second voltage difference (e.g., 7.5V) between the first voltage signal V1 and the third voltage signal V3, a third voltage difference (e.g., also 11V) between the second voltage signal V2 and the third voltage signal V3, the first voltage difference and the second voltage difference are both greater than a first preset value (e.g., 3V), and the third voltage difference is greater than or equal to a second preset value (e.g., 7V). At this time, a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 and between the first viewing angle control electrode 111 and the third viewing angle control electrode 122, and a strong horizontal electric field is formed between the second viewing angle control electrode 121 and the third viewing angle control electrode 122. Under the action of the vertical electric field and the horizontal electric field, and with the alignment pretilt angle (first alignment pretilt angle, second alignment pretilt angle) between 0° and 7°, and the angle between the alignment direction (first alignment direction, second alignment direction) and the first electrode strip 121a between 0° and 20°, the positive liquid crystal molecules can be driven to deflect in the horizontal and vertical directions toward the preset direction, so that the positive liquid crystal molecules in the first liquid crystal layer 13 are in a disordered and scattered state, and have a scattering effect on light, so as to achieve a wide viewing angle display.

[0122] In this embodiment, since the negative liquid crystal molecules on the side close to the first substrate 10 are aligned approximately perpendicular to the first substrate 10, and the negative liquid crystal molecules on the side close to the second substrate 20 are aligned approximately perpendicular to the second substrate 20, the driving power consumption at a wide viewing angle can be reduced.

[0123] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the fifth embodiment, and will not be described in detail here.

[0124] Fig.21 and Fig. 22 FIG. 1 is a schematic diagram of a planar structure of a display device in an embodiment of the present invention. Fig.21 and Fig. 22The display device is provided with a viewing angle switching button 50 for the user to send a viewing angle switching request to the display device. The viewing angle switching button 50 may be a physical button (such as Fig.21 As shown), it can also be a software control or application (APP) to implement the switching function (such as Fig. 22 As shown, for example, a wide and narrow viewing angle is set by a sliding bar). When a user needs to switch between a wide viewing angle and a narrow viewing angle, a viewing angle switching request can be sent to the display device by operating the viewing angle switching button 50, and finally the driving chip 60 controls the electrical signals applied to the first viewing angle control electrode 111, the second viewing angle control electrode 121 and the third viewing angle control electrode 122, so that the display device can realize the switching between a wide viewing angle and a narrow viewing angle. When switching to a wide viewing angle, the driving method thereof adopts the driving method corresponding to the wide-angle mode, and when switching to a narrow viewing angle, the driving method thereof adopts the driving method corresponding to the narrow viewing angle mode. Therefore, the display device of the embodiment of the present invention has strong operational flexibility and convenience, and achieves a multifunctional display device integrating entertainment video and privacy.

[0125] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0126] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A display panel, characterized in that: The invention comprises a dimming box (10) and a display liquid crystal box (20) which are stacked on each other, a first polarizer (31) being arranged between the dimming box (10) and the display liquid crystal box (20), a second polarizer (32) being arranged on a side of the display liquid crystal box (20) away from the dimming box (10), and a light transmission axis of the first polarizer (31) and a light transmission axis of the second polarizer (32) being perpendicular to each other; The dimming box (10) comprises a first substrate (11), a second substrate (12) arranged opposite to the first substrate (11), and a first liquid crystal layer (13) arranged between the first substrate (11) and the second substrate (12); the first substrate (11) is provided with a first viewing angle control electrode (111) on a side facing the first liquid crystal layer (13); the second substrate (12) is provided with a second viewing angle control electrode (121) and a third viewing angle control electrode (122) cooperating with the first viewing angle control electrode (111) on a side facing the first liquid crystal layer (13); the second viewing angle control electrode (121) comprises a plurality of first electrode strips (121a); ​​the third viewing angle control electrode (122) comprises a plurality of second electrode strips (122a); the projections of the first electrode strips (121a) and the second electrode strips (122a) on the second substrate (12) are parallel to each other and arranged alternately; Applying a first voltage signal (V1) to the first viewing angle control electrode (111), applying a second voltage signal (V2) to the second viewing angle control electrode (121), and applying a third voltage signal (V3) to the third viewing angle control electrode (122); In the narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer (13) are in a lying posture or a standing posture; In the wide viewing angle mode, the first voltage signal (V1) is a DC common voltage signal, the second voltage signal (V2) is a first AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, and the third voltage signal (V3) is a second AC voltage signal that fluctuates up and down with the DC common voltage signal as the center. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period. At the same time, the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their periods. There is a first voltage difference between the first voltage signal (V1) and the second voltage signal (V2), a second voltage difference between the first voltage signal (V1) and the third voltage signal (V3), and a third voltage difference between the second voltage signal (V2) and the third voltage signal (V3). The first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to a second preset value, so that the liquid crystal molecules in the first liquid crystal layer (13) are in a disordered and scattered state and scatter light.

2. The display panel according to claim 1, characterized in that: A first alignment layer is provided on a side of the first substrate (11) facing the first liquid crystal layer (13); a first alignment pretilt angle of the first alignment layer is between 0 and 90°; and a first angle between a projection of a first alignment direction of the first alignment layer on the second substrate (12) and the first electrode strip (121a) is between 0 and 20°; A second alignment layer is provided on a side of the second substrate (12) facing the first liquid crystal layer (13); a second alignment pretilt angle of the second alignment layer is between 0 and 90°; and a second angle between a projection of a second alignment direction of the second alignment layer on the second substrate (12) and the first electrode strip (121a) is between 0 and 20°.

3. The display panel according to claim 2, characterized in that: The first liquid crystal layer (13) uses positive liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 0 and 7°, and the second alignment pretilt angle of the second alignment layer is between 0 and 7°; or the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 83° and 90°.

4. The display panel according to claim 2, characterized in that: The first liquid crystal layer (13) uses positive liquid crystal molecules or negative liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°.

5. A method for driving a display panel, characterized in that: Used to drive the display panel according to any one of claims 1 to 4, the driving method comprising: Applying a first voltage signal (V1) to the first viewing angle control electrode (111), applying a second voltage signal (V2) to the second viewing angle control electrode (121), and applying a third voltage signal (V3) to the third viewing angle control electrode (122); In a narrow viewing angle mode, controlling the liquid crystal molecules in the first liquid crystal layer (13) to be in a lying posture or a standing posture; In the wide viewing angle mode, the first voltage signal (V1) is a DC common voltage signal, the second voltage signal (V2) is a first AC voltage signal that fluctuates up and down with the DC common voltage signal as the center, and the third voltage signal (V3) is a second AC voltage signal that fluctuates up and down with the DC common voltage signal as the center. The first AC voltage signal and the second AC voltage signal have different amplitudes and the same period. At the same time, the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their periods. There is a first voltage difference between the first voltage signal (V1) and the second voltage signal (V2), a second voltage difference between the first voltage signal (V1) and the third voltage signal (V3), and a third voltage difference between the second voltage signal (V2) and the third voltage signal (V3). The first pressure difference and the second pressure difference are both greater than a first preset value, and the third pressure difference is greater than or equal to a second preset value, so that the liquid crystal molecules in the first liquid crystal layer (13) are in a disordered and scattered state and scatter light.

6. The method for driving a display panel according to claim 5, characterized in that: The first liquid crystal layer (13) uses positive liquid crystal molecules, the first alignment pretilt angle of the first alignment layer is between 0 and 7°, and the second alignment pretilt angle of the second alignment layer is between 0 and 7°; or the first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 83° and 90°; The driving method comprises: in a narrow viewing angle mode, the first voltage signal (V1), the second voltage signal (V2) and the third voltage signal (V3) are all direct current common voltage signals, so that the positive liquid crystal molecules in the first liquid crystal layer (13) maintain an initial posture.

7. The method for driving a display panel according to claim 5, characterized in that: The first alignment pretilt angle of the first alignment layer is between 83° and 90°, and the second alignment pretilt angle of the second alignment layer is between 0° and 7°; The first liquid crystal layer (13) uses positive liquid crystal molecules, and the driving method comprises: in a narrow viewing angle mode, there is a fourth voltage difference between the first voltage signal (V1) and the second voltage signal (V2), and between the first voltage signal (V1) and the third voltage signal (V3), and the fourth voltage difference is greater than or equal to a third preset value, so that the positive liquid crystal molecules in the first liquid crystal layer (13) are in a standing posture; Alternatively, the first liquid crystal layer (13) uses negative liquid crystal molecules, and the driving method comprises: in a narrow viewing angle mode, there is a fourth voltage difference between the first voltage signal (V1) and the second voltage signal (V2), and between the first voltage signal (V1) and the third voltage signal (V3), and the fourth voltage difference is greater than or equal to a third preset value, so that the negative liquid crystal molecules in the first liquid crystal layer (13) are in a lying posture.

8. A display panel, characterized in that: The invention comprises a dimming box (10) and a display liquid crystal box (20) which are stacked on each other, a first polarizer (31) being arranged between the dimming box (10) and the display liquid crystal box (20), a second polarizer (32) being arranged on a side of the display liquid crystal box (20) away from the dimming box (10), and a light transmission axis of the first polarizer (31) and a light transmission axis of the second polarizer (32) being perpendicular to each other; The dimming box (10) comprises a first substrate (11), a second substrate (12) arranged opposite to the first substrate (11), and a first liquid crystal layer (13) arranged between the first substrate (11) and the second substrate (12); the second substrate (12) is provided with a second viewing angle control electrode (121) and a third viewing angle control electrode (122) which cooperate with each other on a side facing the first liquid crystal layer (13); the second viewing angle control electrode (121) comprises a plurality of first electrode strips (121a); ​​the third viewing angle control electrode (122) comprises a plurality of second electrode strips (122a); the projections of the first electrode strips (121a) and the second electrode strips (122a) on the second substrate (12) are parallel to each other and are arranged alternately; The first liquid crystal layer (13) uses negative liquid crystal molecules, a first alignment layer is provided on a side of the first substrate (11) facing the first liquid crystal layer (13), a first alignment pretilt angle of the first alignment layer is between 83° and 90°, a first angle between a projection of a first alignment direction of the first alignment layer on the second substrate (12) and the first electrode strip (121a) is between 0° and 20°, a second alignment layer is provided on a side of the second substrate (12) facing the first liquid crystal layer (13), a second alignment pretilt angle of the second alignment layer is between 83° and 90°, and a second angle between a projection of a second alignment direction of the second alignment layer on the second substrate (12) and the first electrode strip (121a) is between 0° and 20°; In the narrow viewing angle mode, the negative liquid crystal molecules in the first liquid crystal layer (13) are in a standing posture; In the wide viewing angle mode, a second voltage signal (V2) is applied to the second viewing angle control electrode (121), and a third voltage signal (V3) is applied to the third viewing angle control electrode (122); a fifth voltage difference exists between the second voltage signal (V2) and the third voltage signal (V3); the fifth voltage difference is greater than or equal to a fourth preset value, so that the negative liquid crystal molecules in the first liquid crystal layer (13) are in a disordered and scattered state and scatter light; the second voltage signal (V2) is a first alternating voltage signal that fluctuates up and down with a direct current common voltage signal as a center; the third voltage signal (V3) is a second alternating voltage signal that fluctuates up and down with a direct current common voltage signal as a center; the first alternating voltage signal and the second alternating voltage signal have different amplitudes and the same period; at the same time, the phases of the first alternating voltage signal and the second alternating voltage signal are staggered by 10% to 25% of their periods.

9. A method for driving a display panel, characterized in that: For driving the display panel as claimed in claim 8, the driving method comprising: In a narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer (13) are controlled to maintain an initial standing posture; in a wide viewing angle mode, a second voltage signal (V2) is applied to the second viewing angle control electrode (121), and a third voltage signal (V3) is applied to the third viewing angle control electrode (122), a fifth voltage difference exists between the second voltage signal (V2) and the third voltage signal (V3), and the fifth voltage difference is greater than or equal to a fourth preset value, so that the negative liquid crystal molecules in the first liquid crystal layer (13) are in a disordered scattered state and scatter light; The second voltage signal (V2) is a first AC voltage signal that fluctuates up and down around the DC common voltage signal, and the third voltage signal (V3) is a second AC voltage signal that fluctuates up and down around the DC common voltage signal, and the first AC voltage signal and the second AC voltage signal have different amplitudes and the same period; At the same time, the phases of the first AC voltage signal and the second AC voltage signal are staggered by 10% to 25% of their cycles.

10. A display device, characterized in that: Comprising the display panel as described in any one of claims 1-4 and 8.

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