CN112666747B

CN112666747B - Display panel, driving method and display device

Info

Publication number: CN112666747B
Application number: CN202110004917.9A
Authority: CN
Inventors: 王新刚
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2022-03-25
Anticipated expiration: 2041-01-04
Also published as: CN112666747A

Abstract

The invention discloses a display panel, a driving method and a display device, wherein the display panel comprises a visual angle control box, a mirror face switching box, a display liquid crystal box, a semi-transparent semi-reflective film, a first polarizer and a second polarizer which are arranged in a laminated mode, wherein the visual angle control box and the mirror face switching box are arranged between the first polarizer and the semi-transparent semi-reflective film and positioned on the same side of the display liquid crystal box; the mirror face switching box comprises a third substrate, a fourth substrate and a second liquid crystal layer arranged between the third substrate and the fourth substrate, and the display panel can be switched among wide visual angles, narrow visual angles and mirror face display.

Description

Display panel, driving method and display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device.

Background

With the continuous progress of the liquid crystal display technology, the viewing angle of the display has been widened from about 120 ° to over 160 °, and people want to effectively protect business confidentiality and personal privacy while enjoying visual experience brought by a large viewing angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. Therefore, in addition to the requirement of wide viewing angle, in many cases, the display device is required to have the function of switching between wide and narrow viewing angles.

In the prior art, a vertical electric field is applied to liquid crystal molecules by using a viewing angle control electrode on one side of a color film substrate (CF), so that liquid crystals deflect in a vertical direction, and a narrow viewing angle mode is realized. By controlling the voltage on the viewing angle control electrode, switching between a wide viewing angle and a narrow viewing angle can be achieved, but the narrow viewing angle of such a display panel is not ideal.

With the development and progress of liquid crystal display technology, the demand of liquid crystal display devices is becoming higher and higher, and at present, a display device that can be used as both a mirror and a display is gaining favor, i.e., a mirror display device. The existing mirror display device is usually prepared by coating a semi-transparent and semi-reflective film on the light emitted from the display panel, and when displaying, the light from the backlight source forms a color picture through the display panel to display; when the display is finished, the light from the external environment irradiates on the semi-transparent semi-reflecting film to realize the display of the mirror surface.

However, in the prior art, there is no display panel that can realize both wide and narrow viewing angle switching and mirror display, so there is an urgent need for a display panel that can realize both wide and narrow viewing angle switching and mirror display.

Disclosure of Invention

In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides a display panel, a driving method thereof and a display device, so as to solve the problem that the display panel in the prior art cannot realize wide and narrow viewing angle switching and mirror display.

The purpose of the invention is realized by the following technical scheme:

the invention provides a display panel, which comprises a visual angle control box, a mirror face switching box, a display liquid crystal box, a semi-transparent semi-reflective film, a first polarizer and a second polarizer which are arranged in a laminated manner, wherein the visual angle control box and the mirror face switching box are both arranged between the first polarizer and the semi-transparent semi-reflective film and positioned on the same side of the display liquid crystal box;

the visual angle control 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, wherein a first visual angle control electrode is arranged on the first substrate, and a second visual angle control electrode matched with the first visual angle control electrode is arranged on the second substrate; the mirror switching box comprises a third substrate, a fourth substrate arranged opposite to the third substrate and a second liquid crystal layer arranged between the third substrate and the fourth substrate, wherein a first mirror control electrode is arranged on the third substrate, a second mirror control electrode matched with the first mirror control electrode is arranged on the fourth substrate, and when the mirror is displayed, the long axis of the second liquid crystal layer is parallel to the third substrate and the fourth substrate, and the long axis of the second liquid crystal layer and the light transmission axis of the first polarizer form 45 degrees, and the second liquid crystal layer has lambda/2 phase delay.

Further, the first liquid crystal layer adopts positive liquid crystal molecules, and in an initial state, the long axis of the first liquid crystal layer is parallel to the first substrate and the second substrate; or the first liquid crystal layer adopts negative liquid crystal molecules, and the long axis of the first liquid crystal layer is vertical to the first substrate and the second substrate in the initial state.

Further, the second liquid crystal layer adopts negative liquid crystal molecules, and in an initial state, the long axis of the second liquid crystal layer is vertical to the third substrate and the fourth substrate; or the second liquid crystal layer adopts positive liquid crystal molecules, and in an initial state, the long axis of the second liquid crystal layer is parallel to the third substrate and the fourth substrate and forms 45 degrees with the transmission axis of the first polarizer, and then the second liquid crystal layer has the phase delay of lambda/2.

Furthermore, the mirror surface switching box is positioned between the visual angle control box and the display liquid crystal box, and the first polaroid is arranged on the first substrate; or the visual angle control box is positioned between the mirror surface switching box and the display liquid crystal box, and the first polaroid is arranged on the third substrate.

Furthermore, the display panel further comprises a third polarizer, the third polarizer is arranged between the display liquid crystal box and the semi-transparent and semi-reflective film, and the transmission axis of the third polarizer is parallel to the transmission axis of the semi-transparent and semi-reflective film.

Furthermore, the first viewing angle control electrode, the second viewing angle control electrode, the first mirror surface control electrode and the second mirror surface control electrode are all electrodes covered on the whole surface.

Furthermore, the semi-transparent and semi-reflective film is a metal wire grid polarizer, the transmission axis of the semi-transparent and semi-reflective film is perpendicular to the wire grid trend of the metal wire grid polarizer, and the reflection axis of the semi-transparent and semi-reflective film is parallel to the wire grid trend of the metal wire grid polarizer.

Further, the display liquid crystal cell comprises an IPS display architecture, an FFS display architecture, a PET display architecture, a VA display architecture or a TN display architecture.

The present invention also provides a driving method of a display panel for driving the display panel as described above, the driving method comprising:

in the wide viewing angle mode, applying corresponding wide viewing angle voltages to the first viewing angle control electrode and the second viewing angle control electrode to enable liquid crystal molecules in the first liquid crystal layer to be in a lying posture or a standing posture, and applying corresponding transmission voltages to the first mirror surface control electrode and the second mirror surface control electrode to enable the liquid crystal molecules in the second liquid crystal layer to be in the standing posture, wherein the second liquid crystal layer does not have a birefringence effect;

in the narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode and the second viewing angle control electrode, so that liquid crystal molecules in the first liquid crystal layer are in an inclined posture, and corresponding transmission voltages are applied to the first mirror surface control electrode and the second mirror surface control electrode, so that liquid crystal molecules in the second liquid crystal layer are in a standing posture, and at the moment, the second liquid crystal layer does not have a birefringence effect;

in a mirror display mode, applying corresponding mirror display voltages to the first viewing angle control electrode and the second viewing angle control electrode, wherein liquid crystal molecules in the first liquid crystal layer are in a lying posture or a standing posture, and applying corresponding reflection voltages to the first mirror control electrode and the second mirror control electrode, so that the liquid crystal molecules in the second liquid crystal layer are in the lying posture, a long axis of the second liquid crystal layer and a transmission axis of the first polarizer form a 45 DEG angle, and the phase delay of the second liquid crystal layer is lambda/2.

The invention also provides a display device comprising the display panel.

The invention has the beneficial effects that: the special design of the transmission axis angle of the semi-transparent semi-reflective film, the first polarizer and the second polarizer is matched with the first visual angle control electrode and the second visual angle control electrode to control the liquid crystal molecules in the first liquid crystal layer to deflect at a specific angle in the vertical direction, and the first mirror surface control electrode and the second mirror surface control electrode control the liquid crystal molecules in the second liquid crystal layer to deflect at a specific angle in the vertical direction, so that the display panel can realize switching between wide visual angle, narrow visual angle and mirror surface display, and integrates the visual angle switching function and the mirror surface switching function on one display panel.

Drawings

FIG. 1 is a schematic structural diagram of a display panel in an initial state according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a display panel with a wide viewing angle according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a display panel with a narrow viewing angle according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a display panel in mirror display according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a light ray principle of a display panel in a mirror display according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a metal wire grid polarizer according to a first embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a display panel in an initial state according to a second embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a display panel in an initial state or a mirror display state according to a third embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a display panel with a wide viewing angle according to a third embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a display panel with a narrow viewing angle according to a third embodiment of the present invention;

FIG. 11 is a schematic plan view of a display device according to the present invention;

FIG. 12 is a second schematic plan view of the display device of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the display panel, the driving method and the display device according to the present invention with reference to the accompanying drawings and the preferred embodiments is as follows:

[ example one ]

Fig. 1 is a schematic structural diagram of a display panel in an initial state according to a first embodiment of the present invention, fig. 2 is a schematic structural diagram of the display panel in a wide viewing angle according to the first embodiment of the present invention, fig. 3 is a schematic structural diagram of the display panel in a narrow viewing angle according to the first embodiment of the present invention, fig. 4 is a schematic structural diagram of the display panel in a mirror display according to the first embodiment of the present invention, fig. 5 is a schematic diagram of a light principle of the display panel in the mirror display according to the first embodiment of the present invention, and fig. 6 is a schematic diagram of a metal wire grid polarizer according to the first embodiment of the present invention.

As shown in fig. 1 to 6, a display panel according to a first embodiment of the present invention includes a viewing angle control box 10, a mirror surface switching box 20, a display liquid crystal cell 30, a transflective film 40, a first polarizer 51 and a second polarizer 52, which are stacked, wherein the viewing angle control box 10 and the mirror surface switching box 20 are both disposed between the first polarizer 51 and the transflective film 40 and located at the same side of the display liquid crystal cell 30, the second polarizer 52 is disposed at a side of the display liquid crystal cell 30 away from the first polarizer 51, a transmission axis of the first polarizer 51 is parallel to a transmission axis of the transflective film 40, a transmission axis of the second polarizer 52 is perpendicular to the transmission axis of the transflective film 40, and a transmission axis of the transflective film 40 is perpendicular to a reflection axis of the transflective film 40. In this embodiment, the mirror surface switching box 20 is located between the viewing angle control box 10 and the display liquid crystal box 30, that is, the first polarizer 51, the viewing angle control box 10, the mirror surface switching box 20, the transflective film 40, the display liquid crystal box 30, and the second polarizer 52 are sequentially stacked from top to bottom.

The viewing angle control box 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a first liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12, wherein the first substrate 11 is provided with a first viewing angle control electrode 111, the second substrate 12 is provided with a second viewing angle control electrode 121 cooperating with the first viewing angle control electrode 111, and the first polarizer 51 is disposed on the first substrate 11 and away from one side of the first liquid crystal layer 13. In this embodiment, the first liquid crystal layer 13 uses positive liquid crystal molecules, that is, liquid crystal molecules having positive dielectric anisotropy. As shown in fig. 1, in the initial state, the long axis of the first liquid crystal layer 13 is parallel to the first substrate 11 and the second substrate 12, i.e. the first liquid crystal layer 13 is in a lying posture, and the positive liquid crystal molecules in the first liquid crystal layer 13 are aligned parallel to the first substrate 11 and the second substrate 12. Of course, the positive liquid crystal molecules may have a small pretilt angle (e.g., less than 7 °) in the initial alignment, that is, the positive liquid crystal molecules initially form a small angle with the first and

second substrates

11 and 12, and the positive liquid crystal molecules may be accelerated to be deflected toward the vertical direction to an inclined state when switching to the narrow viewing angle display.

The mirror surface switching box 20 includes a third substrate 21, a fourth substrate 22 disposed opposite to the third substrate 21, and a second liquid crystal layer 23 disposed between the third substrate 21 and the fourth substrate 22, wherein the third substrate 21 is provided with a first mirror surface control electrode 211, and the fourth substrate 22 is provided with a second mirror surface control electrode 221 mutually matched with the first mirror surface control electrode 211. In the present embodiment, the second liquid crystal layer 23 uses negative liquid crystal molecules, that is, liquid crystal molecules having negative dielectric anisotropy. As shown in fig. 1, in the initial state, the long axis of the second liquid crystal layer 23 is perpendicular to the third substrate 21 and the fourth substrate 22, i.e., the second liquid crystal layer 23 is in a standing posture. Of course, the negative liquid crystal molecules may have a small pretilt angle (e.g., less than 7 °) from the vertical direction at the initial alignment, and the negative liquid crystal molecules may be accelerated to be deflected toward the horizontal direction when switching to the mirror display.

Further, the transflective film 40 is a metal wire grid polarizer, a transmission axis of the transflective film 40 is perpendicular to a wire grid direction of the metal wire grid polarizer, and a reflection axis of the transflective film 40 is parallel to the wire grid direction of the metal wire grid polarizer. The metal wire grid polarizer has a special polarization characteristic of transmitting polarized light perpendicular to the wire grid extending direction (direction) and reflecting polarized light parallel to the wire grid extending direction, and preferably, the metal wire grid polarizer can be printed by using a nano-imprinting technique (or other related techniques). As shown in fig. 5, in the incident light ray a, the polarization direction of the light ray has a first polarization a1 perpendicular to the wire grid extending direction and a second polarization a2 parallel to the wire grid extending direction, while the first polarization a1 perpendicular to the wire grid extending direction can form a transmission light ray C by the metal wire grid polarizer, and the second polarization a2 parallel to the wire grid extending direction can be reflected to form a reflection light ray B. The metal wire grid polarizer is described in more detail with reference to the prior art and will not be described herein.

In this embodiment, the first viewing angle control electrode 111, the second viewing angle control electrode 121, the first mirror surface control electrode 211, and the second mirror surface control electrode 221 are all electrodes covered on the whole surface. The first viewing angle control electrode 111 is a full-surface electrode and covers the first substrate 11 on the side facing the first liquid crystal layer 13, and the second viewing angle control electrode 121 is a full-surface electrode and covers the second substrate 12 on the side facing the first liquid crystal layer 13. The first mirror control electrode 211 is a full-surface electrode and covers the third substrate 21 on the side facing the second liquid crystal layer 23, and the second mirror control electrode 221 is a full-surface electrode and covers the fourth substrate 22 on the side facing the second liquid crystal layer 23. In other embodiments, the first viewing angle control electrode 111 or the second viewing angle control electrode 121 may also be a block electrode corresponding to the sub-pixel, and then the block electrode is controlled by the thin film transistor, that is, the first substrate 11 or the second substrate 12 is made into an array substrate structure, so that the wide and narrow viewing angle switching has area controllability. Of course, the first mirror control electrode 211 or the second mirror control electrode 221 may also be a block electrode corresponding to the sub-pixel, and then the block electrode is controlled by the thin film transistor, that is, the third substrate 21 or the fourth substrate 22 is made into an array substrate structure, so that the mirror switching has area controllability.

Further, the display panel further includes a third polarizer 53, the third polarizer 53 is disposed between the display liquid crystal cell 30 and the transflective film 40, and a transmission axis of the third polarizer 53 is parallel to a transmission axis of the transflective film 40. The provision of the third polarizer 53 may result in a better light control effect of the display liquid crystal cell 30 because the polarization effect of the metal wire grid polarizer is less effective than that of the polarizer. Of course, in other embodiments, the third polarizer 53 may not be provided.

The display liquid crystal cell 30 includes a color filter substrate 31, an array substrate 32 disposed opposite to the color filter substrate 31, and a third liquid crystal layer 33 located between the color filter substrate 31 and the array substrate 32. Preferably, positive liquid crystal molecules, i.e., liquid crystal molecules having positive dielectric anisotropy, are used in the third liquid crystal layer 33. As shown in fig. 1, in the initial state, the positive liquid crystal molecules in the third liquid crystal layer 33 are aligned parallel to the color filter substrate 31 and the array substrate 32, and the alignment directions of the positive liquid crystal molecules near the color filter substrate 31 and the positive liquid crystal molecules near the array substrate 32 are parallel or antiparallel.

The color filter substrate 31 is provided with color resist layers 312 arranged in an array and a black matrix 311 separating the color resist layers 312, and the color resist layers 312 include color resist materials of three colors of red (R), green (G), and blue (B), and correspondingly form sub-pixels of three colors of red (R), green (G), and blue (B).

The array substrate 32 defines a plurality of pixel units on a side facing the third liquid crystal layer 33 by a plurality of scan lines and a plurality of data lines crossing each other in an insulating manner, a pixel electrode 322 and a thin film transistor are provided in each pixel unit, and the pixel electrode 322 is electrically connected to the data line of the adjacent thin film transistor through the thin film transistor. The thin film transistor includes a gate electrode, an active layer, a drain electrode and a source electrode, the gate electrode and the scan line are located on the same layer and electrically connected, the gate electrode and the active layer are isolated by an insulating layer, the source electrode and the data line are electrically connected, and the drain electrode and the pixel electrode 322 are electrically connected through a contact hole.

As shown in fig. 1, in the present embodiment, a common electrode 321 is further disposed on a side of the array substrate 32 facing the third liquid crystal layer 33, and the common electrode 321 and the pixel electrode 322 are located at different layers and insulated and isolated by an insulating layer. The common electrode 321 may be located above or below the pixel electrode 322 (the common electrode 321 is located below the pixel electrode 322 as shown in fig. 1). Preferably, the common electrode 321 is a planar electrode disposed over the entire surface, and the pixel electrode 322 is a block electrode disposed in one block in each pixel unit or a slit electrode having a plurality of electrode bars to form a Fringe Field Switching (FFS) mode. Of course, In other embodiments, the pixel electrode 322 and the common electrode 321 may be located on the same layer, but they are insulated and isolated from each other, each of the pixel electrode 322 and the common electrode 321 may include a plurality of electrode stripes, and the electrode stripes of the pixel electrode 322 and the electrode stripes of the common electrode 321 are alternately arranged to form an In-Plane Switching (IPS) mode; alternatively, in other embodiments, the array substrate 32 is provided with a pixel electrode 322 on a side facing the third liquid crystal layer 33, and the color filter substrate 31 is provided with a common electrode 321 on a side facing the third liquid crystal layer 33 to form a PET display architecture, a TN display architecture or a VA display architecture, and for other descriptions of the PET display architecture, the TN display architecture and the VA display architecture, reference is made to the prior art, which is not repeated herein.

The first substrate 11, the second substrate 12, the third substrate 21, the fourth substrate 22, the color filter substrate 31, and the array substrate 32 may be made of glass, acrylic, polycarbonate, or other materials. The materials of the first viewing angle controlling electrode 111, the second viewing angle controlling electrode 131, the first mirror controlling electrode 211, the second mirror controlling electrode 221, the common electrode 321, and the pixel electrode 322 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or the like. In other embodiments, the second substrate 12 and the third substrate 21 may share one substrate to reduce the cell thickness.

The present embodiment also provides a driving method of a display panel, for driving the display panel as described above, the driving method including:

as shown in fig. 2, in the wide viewing angle mode, the corresponding wide viewing angle voltage is applied to 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 in a lying posture or a standing posture. In this embodiment, the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121 are applied with no voltage or 0V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, no voltage or 0V voltage is applied to the first mirror control electrode 211 and the second mirror control electrode 221, the negative liquid crystal molecules in the second liquid crystal layer 23 are in an initial standing posture, and at this time, the second liquid crystal layer 23 does not have a birefringence effect, so that the display panel realizes a wide viewing angle mode. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 may apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are not substantially deflected and are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 can also apply a voltage of a small voltage difference, for example, a voltage difference of less than 0.5V, and the negative liquid crystal molecules in the second liquid crystal layer 23 are not substantially deflected and are in the initial standing posture. Or the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the positive liquid crystal molecules in the first liquid crystal layer 13 are deflected under the action of the vertical electric field and are perpendicular to the first substrate 11 and the second substrate 12, so as to assume a standing posture.

In the wide viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, a corresponding gray scale voltage is applied to the pixel electrode 322, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field (E1 in fig. 2), so that positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, and realizing normal display of the display panel under the wide viewing angle.

As shown in fig. 3, in the narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121 to bring the liquid crystal molecules in the first liquid crystal layer 13 into a tilted posture. In this embodiment, the first viewing angle control electrode 111 applies a voltage (e.g. 3-6V) with a larger voltage difference relative to the second viewing angle control electrode 121, so that a larger vertical electric field is formed between the first substrate 11 and the second substrate 12 (E2 in fig. 3), the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction and are in an oblique posture, and the long axes of the positive liquid crystal molecules form an angle of 30-60 ° with the first substrate 11 and the second substrate 12, so that the brightness of the display panel in the oblique viewing direction is reduced. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, no voltage or 0V voltage is applied to the first mirror control electrode 211 and the second mirror control electrode 221, and the negative liquid crystal molecules in the second liquid crystal layer 23 are in an initial standing posture, at this time, the second liquid crystal layer 23 does not have a birefringence effect, so that the display panel finally realizes narrow viewing angle display. Of course, in other embodiments, the first mirror control electrode 211 and the second mirror control electrode 221 may also apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the negative liquid crystal molecules in the second liquid crystal layer 23 are not substantially deflected and are in the initial standing posture.

In the narrow viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, a corresponding gray scale voltage is applied to the pixel electrode 322, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field (E1 in fig. 3), so that positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, and realizing normal display of the display panel in the narrow viewing angle.

As shown in fig. 4, in the mirror display mode, corresponding mirror display voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and the liquid crystal molecules in the first liquid crystal layer 13 are in the lying posture or the standing posture, that is, voltages similar to the wide viewing angle are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121. In this embodiment, the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121 are applied with no voltage or 0V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding reflection voltages, so that the liquid crystal molecules in the second liquid crystal layer 23 are in a lying posture and the long axis of the second liquid crystal layer 23 is 45 ° to the transmission axis of the first polarizer 51, that is, the first mirror control electrode 211 applies a voltage having a large voltage difference (for example, greater than 7V) with respect to the second mirror control electrode 221, so that a large vertical electric field (E3 in fig. 4) is formed between the third substrate 21 and the fourth substrate 22, the negative liquid crystal molecules in the second liquid crystal layer 23 are greatly deflected in the vertical direction and are in a lying posture, the long axes of the negative liquid crystal molecules are parallel to the third substrate 21 and the fourth substrate 22 and are 45 ° to the transmission axis of the first polarizer 51, and the phase retardation of the second liquid crystal layer 23 is λ/2. Thereby enabling the display panel to realize mirror display. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a larger voltage difference, for example, the voltage difference is larger than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the positive liquid crystal molecules in the first liquid crystal layer 13 are deflected by the vertical electric field and are perpendicular to the first substrate 11 and the second substrate 12, so as to assume a standing posture.

As shown in fig. 5, in the case of the mirror display, for example, the transmission axis of the first polarizer 51 is 0 °, the transmission axis of the transflective film 40 is 0 °, the reflection axis of the transflective film 40 is 90 °, and the major axis of the negative liquid crystal molecules in the second liquid crystal layer 23 is 45 ° when they lie flat. When external ambient light I passes through the first polarizer 51 to become 0-degree linearly polarized light, the linearly polarized light is not deflected after passing through the first liquid crystal layer 13, the linearly polarized light is deflected by 90 degrees after passing through the second liquid crystal layer 23, the 90-degree linearly polarized light is parallel to the reflection axis of the semi-transparent semi-reflective film 40, the linearly polarized light is deflected by 90 degrees after being reflected by the semi-transparent semi-reflective film 40 and then becomes 180-degree linearly polarized light after passing through the second liquid crystal layer 23, the linearly polarized light is not deflected after passing through the first liquid crystal layer 13, the 180-degree linearly polarized light is parallel to the transmission axis of the first polarizer 51 and finally penetrates out of the first polarizer 51, so that the display panel presents a mirror mode.

The embodiment also provides a display device comprising the display panel. The display device further includes a backlight module 60, the backlight module 60 is disposed on a side of the display liquid crystal cell 30 away from the viewing angle control box 10, and preferably, the backlight module 60 adopts a Collimated Backlight (CBL) mode, which can receive light to ensure a display effect. The backlight module 60 is in a closed state during the mirror display, and is normally turned on only during the wide viewing angle display and the narrow viewing angle display.

The backlight module 60 includes a backlight source 61 and a privacy layer 62, and the privacy layer 62 is used to reduce the range of the light exit angle, so that the narrow viewing angle effect is better. The peep-proof layer 62 is a micro louver structure, and can block light rays with a large incident angle, so that light rays with a small incident angle can pass through the peep-proof layer 62, and the angle range of the light rays passing through the peep-proof layer 62 is reduced. The peep-proof layer 62 includes a plurality of parallel arranged photoresist walls and a light hole between two adjacent photoresist walls, and light absorbing materials are arranged on two sides of the photoresist walls. The backlight 61 may be a side-in type backlight or a collimated type backlight.

[ example two ]

Fig. 7 is a schematic structural diagram of a display panel in an initial state according to a second embodiment of the present invention. As shown in fig. 7, a display panel according to a second embodiment of the present invention is different from the display panel according to the first embodiment (fig. 1 to 6) in that in the present embodiment, the viewing angle control box 10 is located between the mirror surface switching box 20 and the display liquid crystal box 30, and the first polarizer 51 is disposed on the third substrate 21, that is, the first polarizer 51, the mirror surface switching box 20, the viewing angle control box 10, the transflective film 40, the third polarizer 53, the display liquid crystal box 30, and the second polarizer 52 are sequentially stacked from top to bottom. In other embodiments, the first substrate 11 and the fourth substrate 22 may share one substrate to reduce the cell thickness.

in the wide viewing angle mode, a corresponding wide viewing angle voltage is applied to 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 in a lying posture or a standing posture. In this embodiment, the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121 are applied with no voltage or 0V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, no voltage or 0V voltage is applied to the first mirror control electrode 211 and the second mirror control electrode 221, the negative liquid crystal molecules in the second liquid crystal layer 23 are in an initial standing posture, and at this time, the second liquid crystal layer 23 does not have a birefringence effect, so that the display panel realizes a wide viewing angle mode. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 may apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are not substantially deflected and are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 can also apply a voltage of a small voltage difference, for example, a voltage difference of less than 0.5V, and the negative liquid crystal molecules in the second liquid crystal layer 23 are not substantially deflected and are in the initial standing posture. Or the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the positive liquid crystal molecules in the first liquid crystal layer 13 are deflected under the action of the vertical electric field and are perpendicular to the first substrate 11 and the second substrate 12, so as to assume a standing posture.

In the wide viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, a corresponding gray scale voltage is applied to the pixel electrode 322, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field, so that positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, so as to realize normal display of the display panel under a wide viewing angle

In the narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121 to put the liquid crystal molecules in the first liquid crystal layer 13 in a tilted posture. In this embodiment, the first viewing angle control electrode 111 applies a voltage (e.g. 3-6V) with a larger voltage difference relative to the second viewing angle control electrode 121, so that a larger vertical electric field is formed between the first substrate 11 and the second substrate 12, the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction and are in an oblique posture, and the long axes of the positive liquid crystal molecules form an angle of 30-60 ° with the first substrate 11 and the second substrate 12, so that the brightness of the display panel in the oblique viewing direction is reduced. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, no voltage or 0V voltage is applied to the first mirror control electrode 211 and the second mirror control electrode 221, and the negative liquid crystal molecules in the second liquid crystal layer 23 are in an initial standing posture, at this time, the second liquid crystal layer 23 does not have a birefringence effect, so that the display panel finally realizes narrow viewing angle display. Of course, in other embodiments, the first mirror control electrode 211 and the second mirror control electrode 221 may also apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the negative liquid crystal molecules in the second liquid crystal layer 23 are not substantially deflected and are in the initial standing posture.

In the narrow viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, the pixel electrode 322 applies a corresponding gray scale voltage, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field, so that the positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, and realizing normal display of the display panel in the narrow viewing angle.

In the mirror display mode, corresponding mirror display voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and the liquid crystal molecules in the first liquid crystal layer 13 are in the lying posture or the standing posture, that is, voltages similar to the wide viewing angle are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121. In this embodiment, the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121 are applied with no voltage or 0V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are in the initial lying posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding reflection voltages, so that the liquid crystal molecules in the second liquid crystal layer 23 are in a lying posture and the long axis of the second liquid crystal layer 23 forms 45 ° with the transmission axis of the first polarizer 51, that is, the first mirror control electrode 211 applies a voltage with a large voltage difference (for example, greater than 7V) with respect to the second mirror control electrode 221, so that a large vertical electric field is formed between the third substrate 21 and the fourth substrate 22, the negative liquid crystal molecules in the second liquid crystal layer 23 are greatly deflected in the vertical direction and are in a lying posture, the long axes of the negative liquid crystal molecules are parallel to the third substrate 21 and the fourth substrate 22 and form 45 ° with the transmission axis of the first polarizer 51, and at this time, the phase retardation of the second liquid crystal layer 23 is λ/2. Thereby enabling the display panel to realize mirror display. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a larger voltage difference, for example, the voltage difference is larger than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the positive liquid crystal molecules in the first liquid crystal layer 13 are deflected by the vertical electric field and are perpendicular to the first substrate 11 and the second substrate 12, so as to assume a standing posture.

In the case of a mirror display, for example, the transmission axis of the first polarizer 51 is 0 °, the transmission axis of the transflective film 40 is 0 °, the reflection axis of the transflective film 40 is 90 °, and the major axis of the negative liquid crystal molecules in the second liquid crystal layer 23 is 45 ° when they lie flat. When external ambient light I passes through the first polarizer 51 to become 0-degree linearly polarized light, the linearly polarized light is deflected by 90 degrees through the second liquid crystal layer 23 and is not deflected after passing through the first liquid crystal layer 13, the 90-degree linearly polarized light is parallel to the reflection axis of the semi-transparent semi-reflective film 40, the linearly polarized light is reflected by the semi-transparent semi-reflective film 40 and is not deflected after passing through the first liquid crystal layer 13, the linearly polarized light is deflected by 90 degrees through the second liquid crystal layer 23 to become 180-degree linearly polarized light, the 180-degree linearly polarized light is parallel to the transmission axis of the first polarizer 51 and finally penetrates out of the first polarizer 51, so that the display panel presents a mirror surface mode.

It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.

[ third example ]

Fig. 8 is a schematic structural diagram of a display panel in an initial state or a mirror display in a third embodiment of the present invention, fig. 9 is a schematic structural diagram of a display panel in a wide viewing angle in the third embodiment of the present invention, and fig. 10 is a schematic structural diagram of a display panel in a narrow viewing angle in the third embodiment of the present invention. As shown in fig. 8 to 10, a display panel according to a third embodiment of the present invention is different from the display panel according to the first embodiment (fig. 1 to 6) in that negative liquid crystal molecules, i.e., liquid crystal molecules having negative dielectric anisotropy, are used as the first liquid crystal layer 13 in this embodiment. As shown in fig. 8, in the initial state, the long axis of the first liquid crystal layer 13 is perpendicular to the first substrate 11 and the second substrate 12, that is, the first liquid crystal layer 13 is in a standing posture. Of course, the negative liquid crystal molecules may have a small pretilt angle (e.g., less than 7 °) from the vertical direction at the initial alignment, and the negative liquid crystal molecules may be accelerated to be deflected toward the horizontal direction to be tilted when switching to a narrow viewing angle display. The second liquid crystal layer 23 employs positive liquid crystal molecules, that is, liquid crystal molecules whose dielectric anisotropy is positive. As shown in fig. 8, in the initial state, the long axis of the second liquid crystal layer 23 is parallel to the third substrate 21 and the fourth substrate 22, and the long axis of the second liquid crystal layer 23 is 45 ° to the transmission axis of the first polarizer 51, the second liquid crystal layer 23 has a phase retardation of λ/2, that is, the second liquid crystal layer 23 is in a lying posture, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the third substrate 21 and the fourth substrate 22, and the second liquid crystal layer 23 can have a phase retardation of λ/2 by setting the thickness of the second liquid crystal layer 23. Of course, the positive liquid crystal molecules may have a small pretilt angle (e.g., less than 7 °) when initially aligned, that is, the positive liquid crystal molecules initially form a small angle with the third substrate 21 and the fourth substrate 22, and when switching to display with a wide viewing angle or a narrow viewing angle, the positive liquid crystal molecules may be accelerated to deflect toward the vertical direction and take a standing posture. Of course, in other embodiments, the first liquid crystal layer 13 and the second liquid crystal layer 23 may employ both positive liquid crystal molecules or negative liquid crystal molecules.

as shown in fig. 9, in the wide viewing angle mode, the corresponding wide viewing angle voltage is applied to 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 in a lying posture or a standing posture. In this embodiment, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 are applied with no voltage or 0V, and the positive liquid crystal molecules in the first liquid crystal layer 13 are in the initial standing posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, the first mirror control electrode 211 and the second mirror control electrode 221 apply voltages with large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the third substrate 21 and the fourth substrate 22 (E3 in fig. 9), the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected under the action of the vertical electric field and are perpendicular to the third substrate 21 and the fourth substrate 22 in a standing posture, at this time, the second liquid crystal layer 23 does not have a birefringence effect, so that the display panel realizes a wide viewing angle mode. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 may apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the negative liquid crystal molecules in the first liquid crystal layer 13 are not substantially deflected and are in the initial standing posture. Or the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the negative liquid crystal molecules in the first liquid crystal layer 13 are deflected under the action of the vertical electric field and are parallel to the first substrate 11 and the second substrate 12, and the first liquid crystal layer is in a lying posture.

In the wide viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, a corresponding gray scale voltage is applied to the pixel electrode 322, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field (E1 in fig. 9), so that positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, and realizing normal display of the display panel under a wide viewing angle or a narrow viewing angle.

As shown in fig. 10, in the narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121 to bring the liquid crystal molecules in the first liquid crystal layer 13 into a tilted posture. In this embodiment, the first viewing angle control electrode 111 applies a voltage (e.g. 3-6V) with a larger voltage difference relative to the second viewing angle control electrode 121, so that a larger vertical electric field is formed between the first substrate 11 and the second substrate 12 (E2 in fig. 10), the negative liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction and are in an oblique posture, and the long axes of the negative liquid crystal molecules form an angle of 30-60 ° with the first substrate 11 and the second substrate 12, so that the brightness of the display panel in the oblique viewing direction is reduced. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding transmission voltages to make the liquid crystal molecules in the second liquid crystal layer 23 in a standing posture, that is, the first mirror control electrode 211 and the second mirror control electrode 221 apply voltages with large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the third substrate 21 and the fourth substrate 22 (E3 in fig. 10), the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected under the action of the vertical electric field and are perpendicular to the third substrate 21 and the fourth substrate 22 to take a standing posture, at this time, the second liquid crystal layer 23 does not have a birefringence effect, and thus the display panel finally realizes narrow viewing angle display.

In the narrow viewing angle mode, a dc common voltage Vcom is applied to the common electrode 321, a corresponding gray scale voltage is applied to the pixel electrode 322, a voltage difference is formed between the pixel electrode 322 and the common electrode 321 to generate a horizontal electric field (E1 in fig. 10), so that positive liquid crystal molecules in the third liquid crystal layer 33 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltage includes 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 322, the pixel unit exhibits different brightness, thereby displaying different pictures, and realizing normal display of the display panel under a wide viewing angle or a narrow viewing angle.

As shown in fig. 8, in the mirror display mode, corresponding mirror display voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and the liquid crystal molecules in the first liquid crystal layer 13 are in the lying posture or the standing posture, that is, voltages similar to the wide viewing angle are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121. In this embodiment, no voltage or 0V voltage is applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and the negative liquid crystal molecules in the first liquid crystal layer 13 are in the initial standing posture. The first mirror control electrode 211 and the second mirror control electrode 221 apply corresponding reflection voltages, so that the liquid crystal molecules in the second liquid crystal layer 23 are in a lying posture and the long axis of the second liquid crystal layer 23 is 45 ° to the transmission axis of the first polarizer 51, that is, no voltage or 0V voltage is applied to the first mirror control electrode 211 and the second mirror control electrode 221, the positive liquid crystal molecules in the second liquid crystal layer 23 are in an initial lying posture, the long axis of the positive liquid crystal molecules is parallel to the third substrate 21 and the fourth substrate 22 and is 45 ° to the transmission axis of the first polarizer 51, and then the phase retardation of the second liquid crystal layer 23 is λ/2. Thereby enabling the display panel to realize mirror display. Of course, in other embodiments, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 may apply a voltage with a small voltage difference, for example, a voltage difference less than 0.5V, and the negative liquid crystal molecules in the first liquid crystal layer 13 are not substantially deflected and are in the initial standing posture. The first mirror control electrode 211 and the second mirror control electrode 221 can also apply a voltage of a small voltage difference, for example, a voltage difference of less than 0.5V, and the positive liquid crystal molecules in the second liquid crystal layer 23 are not substantially deflected and are in the initial lying posture. Or the first viewing angle control electrode 111 and the second viewing angle control electrode 121 apply a voltage with a large voltage difference, for example, the voltage difference is greater than 7V, a strong vertical electric field is formed between the first substrate 11 and the second substrate 12, and the negative liquid crystal molecules in the first liquid crystal layer 13 are deflected under the action of the vertical electric field and are parallel to the first substrate 11 and the second substrate 12, and the first liquid crystal layer is in a lying posture.

In the case of the mirror display, referring to fig. 5, for example, the transmission axis of the first polarizer 51 is 0 °, the transmission axis of the transflective film 40 is 0 °, the reflection axis of the transflective film 40 is 90 °, and the major axis of the negative liquid crystal molecules in the second liquid crystal layer 23 is 45 ° when they lie flat. When external ambient light I passes through the first polarizer 51 to become 0-degree linearly polarized light, the linearly polarized light is not deflected after passing through the first liquid crystal layer 13, the linearly polarized light passes through the second liquid crystal layer 23 to be deflected by 90 degrees, the 90-degree linearly polarized light is parallel to the reflection axis of the semi-transparent semi-reflective film 40, the linearly polarized light is reflected by the semi-transparent semi-reflective film 40 to be deflected by 90 degrees through the second liquid crystal layer 23 to become 180-degree linearly polarized light, the linearly polarized light is not deflected after passing through the first liquid crystal layer 13, the 180-degree linearly polarized light is parallel to the transmission axis of the first polarizer 51 and finally penetrates out of the first polarizer 51, and therefore the display panel is in a mirror mode.

Fig. 11 and 12 are schematic plan views illustrating a display device according to an embodiment of the present invention, and referring to fig. 11 and 12, the display device is provided with a viewing angle switching key 70 for a user to send a viewing angle switching request to the display device. The view switching key 70 may be a physical key (as shown in fig. 11), or may be a software control or application program (APP) to implement a switching function (as shown in fig. 12, for example, setting a wide view and a narrow view through a slider). 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 key 70, and finally the driving chip 80 controls the electric signals applied to the first viewing angle control electrode 111, the second viewing angle control electrode 121, the first mirror surface control electrode 211 and the second mirror surface control electrode 221, the display device can realize the switching among wide visual angle, narrow visual angle and mirror surface display, when the wide visual angle is switched, the driving method adopts the driving method corresponding to the wide angle mode, when the narrow angle mode is switched, the driving method adopts the driving method corresponding to the narrow angle mode, when the mirror surface display is switched, the driving method adopts the driving method corresponding to the mirror display mode, so that the display device provided by the embodiment of the invention has stronger operation flexibility and convenience, and the multifunctional display device integrating entertainment video and privacy confidentiality is realized.

In this document, the terms of upper, lower, left, right, front, rear and the like are used to define the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A display panel is characterized by comprising a visual angle control box (10), a mirror face switching box (20), a display liquid crystal box (30), a semi-transparent and semi-reflective film (40), a first polarizer (51) and a second polarizer (52) which are arranged in a laminating way, the visual angle control box (10) and the mirror surface switching box (20) are both arranged between the first polaroid (51) and the transflective film (40) and are positioned at the same side of the display liquid crystal box (30), the second polarizer (52) is arranged on the side of the display liquid crystal box (30) far away from the first polarizer (51), the transmission axis of the first polarizer (51) is parallel to the transmission axis of the transflective film (40), the transmission axis of the second polarizer (52) is perpendicular to the transmission axis of the transflective film (40), the transmission axis of the semi-transparent and semi-reflective film (40) is vertical to the reflection axis of the semi-transparent and semi-reflective film (40);

the visual angle control 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), wherein a first visual angle control electrode (111) is arranged on the first substrate (11), and a second visual angle control electrode (121) matched with the first visual angle control electrode (111) is arranged on the second substrate (12); the mirror switching box (20) comprises a third substrate (21), a fourth substrate (22) arranged opposite to the third substrate (21) and a second liquid crystal layer (23) arranged between the third substrate (21) and the fourth substrate (22), wherein a first mirror control electrode (211) is arranged on the third substrate (21), a second mirror control electrode (221) matched with the first mirror control electrode (211) is arranged on the fourth substrate (22), when the mirror is displayed, the long axis of the second liquid crystal layer (23) is parallel to the third substrate (21) and the fourth substrate (22), and the long axis of the second liquid crystal layer (23) and the light transmission axis of the first polarizer (51) form an angle of 45 degrees, and at the moment, the second liquid crystal layer (23) has a phase delay of lambda/2.

2. The display panel according to claim 1, wherein the first liquid crystal layer (13) employs positive liquid crystal molecules, and in an initial state, a long axis of the first liquid crystal layer (13) is parallel to the first substrate (11) and the second substrate (12); or the first liquid crystal layer (13) adopts negative liquid crystal molecules, and the long axis of the first liquid crystal layer (13) is vertical to the first substrate (11) and the second substrate (12) in the initial state.

3. The display panel according to claim 1, wherein the second liquid crystal layer (23) uses negative liquid crystal molecules, and in an initial state, a long axis of the second liquid crystal layer (23) is perpendicular to the third substrate (21) and the fourth substrate (22); or the second liquid crystal layer (23) adopts positive liquid crystal molecules, and in an initial state, the long axis of the second liquid crystal layer (23) is parallel to the third substrate (21) and the fourth substrate (22) and the long axis of the second liquid crystal layer (23) and the transmission axis of the first polarizer (51) form an angle of 45 degrees, and at the moment, the second liquid crystal layer (23) has a phase delay of lambda/2.

4. The display panel according to claim 1, wherein the mirror switching cell (20) is located between the viewing angle control cell (10) and the display liquid crystal cell (30), the first polarizer (51) being disposed on the first substrate (11); or the visual angle control box (10) is positioned between the mirror surface switching box (20) and the display liquid crystal box (30), and the first polaroid (51) is arranged on the third substrate (21).

5. The display panel according to claim 1, further comprising a third polarizer (53), wherein the third polarizer (53) is disposed between the display liquid crystal cell (30) and the transflective film (40), and a transmission axis of the third polarizer (53) and a transmission axis of the transflective film (40) are parallel to each other.

6. The display panel of claim 1, wherein the first viewing angle control electrode (111), the second viewing angle control electrode (121), the first mirror control electrode (211), and the second mirror control electrode (221) are all electrodes covered by a whole surface.

7. The display panel according to claim 1, wherein the transflective film (40) is a metal wire grid polarizer, a transmission axis of the transflective film (40) is perpendicular to a wire grid orientation of the metal wire grid polarizer, and a reflection axis of the transflective film (40) is parallel to the wire grid orientation of the metal wire grid polarizer.

8. The display panel of claim 1, wherein the liquid crystal display cell (30) comprises an IPS display architecture, an FFS display architecture, a PET display architecture, a VA display architecture or a TN display architecture.

9. A driving method for a display panel, for driving the display panel according to any one of claims 1 to 8, the driving method comprising:

in a wide viewing angle mode, applying corresponding wide viewing angle voltages to the first viewing angle control electrode (111) and the second viewing angle control electrode (121) to enable liquid crystal molecules in the first liquid crystal layer (13) to be in a lying posture or a standing posture, and applying corresponding transmission voltages to the first mirror surface control electrode (211) and the second mirror surface control electrode (221) to enable liquid crystal molecules in the second liquid crystal layer (23) to be in a standing posture, wherein the second liquid crystal layer (23) does not have a birefringence effect;

in the narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode (111) and the second viewing angle control electrode (121) to enable liquid crystal molecules in the first liquid crystal layer (13) to be in a tilted posture, and corresponding transmission voltages are applied to the first mirror surface control electrode (211) and the second mirror surface control electrode (221) to enable liquid crystal molecules in the second liquid crystal layer (23) to be in a standing posture, wherein the second liquid crystal layer (23) does not have a birefringence effect;

in a mirror display mode, corresponding mirror display voltages are applied to the first viewing angle control electrode (111) and the second viewing angle control electrode (121), liquid crystal molecules in the first liquid crystal layer (13) are in a lying posture or a standing posture, and corresponding reflection voltages are applied to the first mirror control electrode (211) and the second mirror control electrode (221), so that the liquid crystal molecules in the second liquid crystal layer (23) are in the lying posture, a long axis of the second liquid crystal layer (23) forms 45 degrees with a transmission axis of the first polarizer (51), and at the moment, the phase delay of the second liquid crystal layer (23) is lambda/2.

10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.