CN113093412B

CN113093412B - Display panel, control method and display device

Info

Publication number: CN113093412B
Application number: CN202110389563.4A
Authority: CN
Inventors: 熊鑫; 王永志; 彭涛
Original assignee: Wuhan Tianma Microelectronics Co Ltd
Current assignee: Wuhan Tianma Microelectronics Co Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2023-11-03
Anticipated expiration: 2041-04-12
Also published as: CN113093412A

Abstract

The invention provides a display panel, a control method and a display device, relates to the technical field of display, and is used for improving light transmittance at a position corresponding to a light sensing device in the display panel and improving display effect at the position. The display panel comprises a first optical layer, a second optical layer, a magneto-optical crystal layer, a linear polarizer and a half wave plate; the first optical layer and the second optical layer decompose the incident natural light into first linearly polarized light and second linearly polarized light which are spatially separated, and synthesize the incident first linearly polarized light and second linearly polarized light into natural light; the first linearly polarized light and the second linearly polarized light are polarized along a first direction and a second direction respectively; the magneto-optical crystal layer rotates the polarization direction of linearly polarized light by a preset angle under the action of a magnetic field; the linear polarizer comprises a first area and a second area; in the first region and the second region, the transmission axes of the linear polarizer extend in the third direction and the fourth direction, respectively.

Description

Display panel, control method and display device

[ field of technology ]

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

[ background Art ]

With the increase of the diversified use demands of users on display devices, various sensors are mounted and designed in the display panel in the design process of the display panel. The sensor includes a light sensitive device that is sensitive to light.

In order to simultaneously meet the design requirement of a user on the high screen ratio of the display device, the design of setting the light sensing device to correspond to the display area of the display panel is currently presented: for example, the under-screen camera technology is to set the camera at the side of the sub-pixel located in the display area, which faces away from the light. By adopting the design mode, on the basis of improving the screen occupation ratio of the display device, higher requirements are put forward on the light transmittance of the position where the light sensing device is arranged in the display panel. On the basis of the above, how to provide a better display effect at the position of the display panel corresponding to the position where the light sensing device is arranged is also an important research point of related technicians.

[ invention ]

In view of the above, embodiments of the present invention provide a display panel, a control method, and a display device for improving light transmittance at a location of the display panel where a light sensing device is disposed, and improving display effect at the location.

In one aspect, an embodiment of the present invention provides a display panel, including at least one polarization adjustment film group, the polarization adjustment film group including:

a first optical layer and a second optical layer stacked in a thickness direction of the display panel; the first optical layer and the second optical layer are capable of decomposing incident natural light into first linearly polarized light and second linearly polarized light that are spatially separated, and synthesizing the incident first linearly polarized light and the second linearly polarized light into natural light; the polarization direction of the first linearly polarized light is the first direction, and the polarization direction of the second linearly polarized light is the second direction; the first direction and the second direction are orthogonal;

a polarization adjustment layer located between the first optical layer and the second optical layer; the polarized light adjusting layer comprises a magneto-optical crystal layer, a linear polarizer and a half wave plate which are laminated along the thickness direction of the display panel; wherein, the liquid crystal display device comprises a liquid crystal display device,

under the action of a magnetic field, the magneto-optical crystal layer is used for rotating the polarization direction of linearly polarized light by a preset angle;

the linear polarizer comprises a first area and a second area; in the first region, a transmission axis of the linear polarizer extends along a third direction; in the second region, a transmission axis of the linear polarizer extends in a fourth direction; the third direction is orthogonal to the fourth direction.

In another aspect, an embodiment of the present invention provides a display device, where the display device includes the display panel described above.

In still another aspect, an embodiment of the present invention provides a method for controlling a display panel, where the display panel includes at least one polarization adjustment film group, and the polarization adjustment film group includes:

a first optical layer and a second optical layer stacked in a thickness direction of the display panel; the first optical layer and the second optical layer are capable of decomposing incident natural light into first linearly polarized light and second linearly polarized light that are spatially separated, and synthesizing the incident first linearly polarized light and the second linearly polarized light into natural light; the polarization direction of the first linearly polarized light is the first direction, and the polarization direction of the second linearly polarized light is the second direction;

a polarization adjustment layer located between the first optical layer and the second optical layer; the polarized light adjusting layer comprises a magneto-optical crystal layer, a linear polarizer and a half wave plate which are laminated along the thickness direction of the display panel;

The linear polarizer comprises a first area and a second area, wherein the transmission axis of the linear polarizer extends along a third direction in the first area, and the transmission axis of the linear polarizer extends along a fourth direction in the second area, and the third direction and the fourth direction are orthogonal;

the working states of the display panel comprise a first working state and a second working state;

the control method comprises the following steps:

applying a first magnetic field to the magneto-optical crystal layer in the first working state, wherein the polarization adjusting layer rotates the polarization direction of linearly polarized light by a first preset angle under the first magnetic field;

and in the second working state, a second magnetic field is applied to the magneto-optical crystal layer, and under the second magnetic field, the polarization adjusting layer rotates the polarization direction of linearly polarized light by a second preset angle.

According to the display panel, the control method and the display device provided by the embodiment of the invention, the polarization direction of the light rays with different propagation directions in the polarization adjusting layer can be adjusted by changing the magnetic field applied to the magneto-optical crystal layer in the process of propagating the outside light to the inside of the display panel and in the process of propagating the outside light to the inside of the display panel by arranging the optical layer and the second optical layer and arranging the polarization adjusting layer comprising the linear polarizer, the magneto-optical crystal layer and the half wave plate, so that the light rays meeting the requirements pass through the linear polarizer, and the light rays not meeting the requirements are cut off at the linear polarizer. The display panel can ensure the light-emitting intensity and the picture contrast ratio of the display panel in the first working state, and can also meet the high light transmittance requirement of the display panel in the second working state, thereby meeting different use requirements of users.

In addition, when the display panel is in the first working state, the arrangement according to the embodiment of the invention can not only prevent external light from entering the display panel, but also reduce the intensity of reflected ambient light emitted from the display panel. In addition, the linear polarizer is arranged to have two structures with different transmission axis directions, so that linearly polarized light with two polarization directions can still be emitted after passing through the linear polarizer in the transmission process of light emitted by the light-emitting device layer. That is, during display of the display panel, light having two different polarization directions can be emitted from the display panel. Compared with the scheme of arranging the circular polaroid comprising the quarter wave plate and the linear polaroid for reducing the reflectivity in the related art, the scheme of the embodiment of the invention can greatly improve the utilization rate of light rays emitted by the light-emitting device layer in the display process of the display panel, and is beneficial to improving the brightness of the display panel on the basis of not increasing the power consumption of the display panel.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the invention;

FIG. 2 is a schematic view of a film structure in a lighting area of a display panel;

FIG. 3 is a schematic view of natural light passing through the first optical layer;

FIG. 4 is a schematic illustration of the first and second linearly polarized light after passing through the first optical layer;

FIG. 5 is a schematic view of natural light passing through a linear polarizer;

FIG. 6 is a schematic diagram showing the change of polarization direction of polarized light having an angle sigma between the polarization direction and the first direction D1 after passing through the half-wave plate;

FIG. 7 is a schematic diagram of a polarizing prism according to an embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention;

FIG. 9 is a schematic view of external light directed into the display panel having the structure shown in FIG. 8 in a first operating state;

FIG. 10 is a schematic view of external light directed into the display panel having the structure shown in FIG. 8 in a second operating state;

FIG. 11 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;

FIG. 12 is a schematic view of external light directed into the display panel having the structure shown in FIG. 11 in a first operating state;

FIG. 13 is a schematic view of external light directed into the display panel having the structure shown in FIG. 11 in a second operating state;

FIG. 14 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention;

FIG. 15 is a schematic view of external light directed into the display panel having the structure shown in FIG. 14 in a first operating state;

FIG. 16 is a schematic view of external light directed into the display panel having the structure shown in FIG. 14 in a second operating state;

fig. 17 is a schematic diagram of a display device according to an embodiment of the invention.

[ detailed description ] of the invention

For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The embodiment of the invention provides a display panel. Referring to fig. 1, fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, where the display panel includes a display area AA1 and a lighting area AA2, and the display area AA1 at least partially surrounds the lighting area AA2. In the embodiment of the present invention, each of the display area AA1 and the lighting area AA2 includes a plurality of sub-pixels (not shown). That is, both the display area AA1 and the lighting area AA2 can display pictures. To distinguish, a subpixel located in the display area AA1 is named a first subpixel, and a subpixel located in the lighting area AA2 is named a second subpixel. According to the function to be exerted by the display panel, the embodiment of the invention can be provided with the corresponding light sensing device corresponding to the lighting area AA2 of the display panel, so that the display panel can realize other functions besides display. Optionally, the light sensing device includes one or more of a camera module, a fingerprint identification sensor, an iris sensor, a distance sensor, and an ambient light level sensor.

The structure of the display panel of the lighting area AA2 is described below.

In the embodiment of the present invention, as shown in fig. 2, fig. 2 is a schematic diagram of a film structure of a lighting area of a display panel, where the display panel includes a substrate 10, a driving circuit layer 11, and a light emitting device layer 12. The light emitting device layer 12 is located on a side of the driving circuit layer 11 remote from the substrate base plate 10. The first and second sub-pixels include a pixel driving circuit in the driving circuit layer 11, and a light emitting device in the light emitting device layer 12. The pixel driving circuit is electrically connected to the light emitting device. For example, the light emitting device layer 12 may be provided with a plurality of light emitting devices of different light emitting types, for example, the light emitting device may be provided as an organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED), or a Micro light emitting diode (Micro Light Emitting Diode, abbreviated as Micro-LED), or a quantum dot light emitting diode (Quantum Light Emitting Diode, abbreviated as QLED), or the like, which is not limited by the embodiments of the present invention. A light sensing device (not shown) may be subsequently provided on the side of the substrate base 10 remote from the driving circuit layer 11.

In the embodiment of the present invention, the lighting area AA2 further includes at least one polarization adjustment film group 2. As shown in fig. 2, four polarization adjustment film groups 2 are disposed in the lighting area AA2, where the polarization adjustment film groups 2 include a first optical layer 21 and a second optical layer 22, and the first optical layer 21 and the second optical layer 22 are located on a side of the light emitting device layer 12 away from the driving circuit layer 11. The first optical layer 21 and the second optical layer 22 are stacked in the thickness direction z of the display panel. The polarization adjustment film group 1 further includes a polarization adjustment layer between the first optical layer 21 and the second optical layer 22. In the embodiment of the present invention, the polarization adjustment layer includes a magneto-optical crystal layer 23, a linear polarizer 24, and a half wave plate 25, which are stacked in the thickness direction z of the display panel.

The natural light can be decomposed into first and second linearly polarized light spatially separated from each other after passing through the first and second optical layers 21 and 22. The polarization direction of the first linearly polarized light is a first direction D1, and the polarization direction of the second linearly polarized light is a second direction D2; the first direction D1 and the second direction D2 are orthogonal. The first linearly polarized light and the second linearly polarized light can be combined into natural light after passing through the first optical layer 21 and the second optical layer 22. As shown in fig. 3, fig. 3 is a schematic diagram of natural light passing through the first optical layer, after the natural light passes through the first optical layer 21, the first linearly polarized light exits from the first region 211 of the first optical layer 21, and the second linearly polarized light exits from the second region 212 of the first optical layer. The solid unidirectional arrows on both sides of the first optical layer 21 in fig. 3 represent the propagation direction of light, and the dashed bidirectional arrows represent the polarization direction of light, and the arrows in the remaining figures are as defined herein unless otherwise specified. As shown in fig. 4, fig. 4 is a schematic diagram of the first linearly polarized light and the second linearly polarized light after passing through the first optical layer, the second linearly polarized light incident from the first area 211 of the first optical layer 21 and the first linearly polarized light incident from the second area 212 of the first optical layer 21 are combined into natural light after passing through the first optical layer 21. The effect of the second optical layer on light is the same as the first optical layer shown in fig. 3 and 4. Illustratively, the first optical layer 21 and the second optical layer 22 may be made of a birefringent material.

As shown in fig. 5, fig. 5 is a schematic view of natural light passing through the linear polarizer, and the linear polarizer 23 includes a first region 231 and a second region 232; in the first region 231, the transmission axis of the linear polarizer extends along the third direction D3. That is, the natural light is changed into linearly polarized light polarized in the third direction D3 after exiting through the first region 231 of the linear polarizer 23. In the second region 232, the transmission axis of the linear polarizer 23 extends in the fourth direction D4; that is, the natural light is changed into linearly polarized light polarized in the fourth direction D4 after exiting through the second region 232 of the linear polarizer 23. In the embodiment of the present invention, the third direction D3 and the fourth direction D4 are orthogonal.

The magneto-optical crystal layer 24 is capable of rotating the polarization direction of linearly polarized light by a preset angle clockwise or counterclockwise under the influence of a magnetic field. When the display panel works, different magnetic fields can be applied to the magneto-optical crystal layer 24 according to different application scene requirements, so that light with different polarization directions is emitted through the magneto-optical crystal layer 24. Illustratively, the material of the magneto-optical crystal layer 24 includes any one of magnesium aluminum garnet, iron aluminum garnet, manganese aluminum garnet, lime iron garnet, lime chrome garnet, and yttrium iron garnet.

After passing through the half wave plate 25, the polarization direction of the outgoing light can also rotate by a corresponding angle according to the included angle between the polarization direction of the incoming light and the fast axis of the half wave plate 25.

Specifically, referring to fig. 6, fig. 6 is a schematic diagram showing a change of polarization direction of linearly polarized light having an angle σ between the polarization direction and the first direction D1 after passing through the half-wave plate, wherein an angle β between an optical axis 250 of the half-wave plate and the first direction D1, and after the light passes through the half-wave plate, the polarization direction of the outgoing light rotates by 2θ relative to the polarization direction of the incoming light toward a fast axis 250 of the half-wave plate, wherein θ is an angle between the polarization direction of the incoming light and the fast axis 250 of the half-wave plate. In fig. 6, θ is indicated as an acute angle. As can be seen from fig. 6, after the linearly polarized light having the angle σ between the polarization direction of the incident light and the first direction D1 passes through the half-wave plate, the angle δ between the polarization direction of the outgoing light and the first direction D1 satisfies:

δ＝β+θ＝β+(β-σ)＝2β-σ (1)

in operation of the display panel, light emitted from the light emitting device layer 12 passes through the first optical layer 21 and becomes first linearly polarized light and second linearly polarized light in the process of exiting the display panel. Then, the first linearly polarized light and the second linearly polarized light are directed to the second optical layer 22 through a polarization adjustment layer including a linear polarizer 24, a magneto-optical crystal layer 24, and a half wave plate 25. The external light is changed into the first linearly polarized light and the second linearly polarized light after passing through the second optical layer 22 in the process of being incident into the display panel. Then, the first linearly polarized light and the second linearly polarized light are directed to the first optical layer 21 through the above-mentioned polarization adjustment layer. In the case that the lighting area AA2 includes multiple working states, such as a first working state for displaying and a second working state for lighting, in different working states, the embodiment of the present invention may adjust the polarization directions of the first linearly polarized light and the second linearly polarized light in the propagation process in the polarization adjustment layer by adjusting and controlling the magnitude of the magnetic field of the magneto-optical crystal layer 24. For example, in the first working state, the embodiment of the present invention may apply a first magnetic field to the magneto-optical crystal layer 24, where the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a first preset angle, where the setting of the first preset angle may satisfy the following conditions:

1. The light emitted by the light emitting device layer 12 is two linearly polarized light beams with mutually orthogonal polarization directions when propagating to the second optical layer 22, so that the two polarized light beams can be emitted as natural light through the second optical layer 22;

2. the polarization direction of the two polarized lights when the external lights are transmitted to the linear polarizer 23 is different from the transmission axis direction of the first area 231 and the second area 232 of the linear polarizer 23, so that the external lights can be cut off at the position of the linear polarizer 23, the external lights are prevented from being emitted to the material with stronger reflectivity inside the display panel, the intensity of the reflected ambient lights emitted from the display panel is reduced, and the contrast of the display picture of the display panel is improved.

In the second working state, the embodiment of the present invention may apply a second magnetic field to the magneto-optical crystal layer 24, where the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a second preset angle, where the setting of the second preset angle may satisfy the following conditions: the polarization directions of the two polarized lights transmitted to the linear polarizer 23 are respectively parallel to the directions of the transmission axes of the first area 231 and the second area 232 of the linear polarizer 23, so that external light can pass through the linear polarizer 23, and then can enter the light sensing device arranged in the corresponding lighting area AA2 through the first optical layer 21, and the light sensing device can work normally.

As can be seen from the above working process of the display panel, in the display panel provided by the embodiment of the invention, by arranging the optical layer 21 and the second optical layer 22 and arranging the polarization adjusting layer comprising the linear polarizer 24, the magneto-optical crystal layer 24 and the half-wave plate 25, in the process that the light emitted by the light emitting device in the light emitting device layer 12 propagates to the outside of the display panel, and in the process that the outside light propagates to the inside of the display panel, the polarization directions of the light with different propagation directions in the polarization adjusting layer can be adjusted by changing the magnetic field applied to the magneto-optical crystal layer 24, so that the light meeting the requirements passes through the linear polarizer 23, and the light not meeting the requirements is cut off at the linear polarizer 23, that is, the light intensity and the high picture contrast of the display panel in the first working state can be ensured, the high light transmittance requirement of the display panel in the second working state can be met, and the different use requirements of users can be met.

In addition, in the first working state, according to the arrangement of the embodiment of the invention, external light can be prevented from entering the display panel, and the intensity of reflected ambient light emitted from the display panel can be reduced. In the embodiment of the invention, the linear polarizer 23 is arranged to have two structures with different transmission axis directions, so that light with two polarization directions can still be emitted after passing through the linear polarizer 23 in the transmission process of light emitted by the light-emitting device layer. That is, during display of the display panel, light having two different polarization directions can be emitted from the display panel. Compared with the scheme of arranging the circular polaroid comprising the quarter wave plate and the linear polaroid for reducing the reflectivity in the related art, the scheme of the embodiment of the invention can greatly improve the light utilization rate in the display process of the display panel, and is beneficial to improving the brightness of the display panel on the basis of not increasing the power consumption of the display panel.

For example, the polarization adjustment film group 2 may be located only in the lighting area AA2 of the display panel. Alternatively, the area of the polarization adjustment film group 2 may be set larger, so that the polarization adjustment film group 2 covers the display area AA1 of the display panel in addition to the lighting area AA2. When the polarized light adjusting film group 2 is arranged to cover the display area AA1 and the lighting area AA2, the magnetic fields on the magneto-optical crystal layer 24 positioned in the display area AA1 and the magneto-optical crystal layer 24 positioned in the lighting area AA2 can be independently controlled to adapt to the requirements of different working states of the two areas.

When the number of the polarization adjustment film groups 2 is set to be plural, as shown in fig. 2, the plural polarization adjustment film groups 2 are arrayed in a plane parallel to the plane in which the substrate 10 is located. The size of the single polarization adjustment film group 2 may be adjusted according to the process capability of each film layer and the area of the display panel.

For example, when the display panel is used for displaying, both the first subpixel located in the display area AA1 and the second subpixel located in the lighting area AA2 may be turned on, so that both the display area AA1 and the lighting area AA2 can be used for displaying. When the lighting area AA2 is used for displaying, the lighting area AA2 and the display area AA1 can together display a complete picture. Alternatively, the lighting area AA2 and the display area AA1 may be displayed independently. For example, the lighting area AA2 may be used to display information such as date, time, and incoming call reminder.

When the light sensing device arranged corresponding to the lighting area AA2 works, the second sub-pixel positioned in the lighting area AA2 can be not lighted, so that light in the external environment can be emitted to the light sensing device through the lighting area AA2, and the light sensing device works.

Alternatively, in the embodiment of the present invention, the first optical layer 21 and the second optical layer 22 each include a polarizing prism. The polarizing prism is a polarizing device made of a crystal having a birefringent property. The natural light is divided into two linearly polarized light beams with mutually perpendicular polarization directions after passing through the polarizing prism. Two mutually perpendicular linearly polarized light beams pass through the polarizing prism and then become natural light. Illustratively, in embodiments of the present invention, the polarizing prism may be a gram (Glan) prism.

Fig. 7 is a schematic view of a polarizing prism according to an embodiment of the present invention, where the polarizing prism is rectangular. The polarizing prism 20 comprises a first sub-prism 201, a second sub-prism 202, a third sub-prism 203 and a fourth sub-prism 204 which are arranged in an adhesive manner, wherein the first sub-prism 201, the second sub-prism 202, the third sub-prism 203 and the fourth sub-prism 204 are triangular prisms with the same size, and the bottom surfaces of the triangular prisms are isosceles right triangles; the sides of the triangular prism include a first side 2001, a second side 2002, and a third side 2003, wherein an included angle between the first side 2001 and the second side 2002 is a right angle. In the polarizing prism 20: the first side of the first sub-prism 201 and the first side of the second sub-prism 202 are parallel to each other; the second side of the first sub-prism 201 and the second side of the second sub-prism 202 are parallel to each other; the third side of the first sub-prism 201 and the third side of the second sub-prism 202 are bonded by an adhesive layer; the first side of the second sub-prism 202 and the first side of the third sub-prism 203 are bonded by an adhesive layer; the second side of the second sub-prism 202 and the second side of the third sub-prism 203 are parallel to each other; the third side of the second sub-prism 202 and the third side of the third sub-prism 203 are parallel to each other; the first side of the third sub-prism 203 and the first side of the fourth sub-prism 204 are parallel to each other; the second side of the third sub-prism 203 and the second side of the fourth sub-prism 204 are parallel to each other; the third side of the third sub-prism 203 and the third side of the fourth sub-prism 204 are bonded by an adhesive layer. The polarizing prism 20 having a rectangular parallelepiped shape is so arranged that its width is equal to the height and its length is equal to twice the width.

In the case of using the polarizing prism 20 having the structure shown in fig. 7 to form a display panel, the second side of the second sub-prism 202 and the fourth sub-prism 204 may be disposed parallel to the plane of the substrate 10 as shown in fig. 2 and 7. In the process of emitting light emitted from the light-emitting device layer 12 to the outside of the display panel, the light enters from the second side surfaces of the second sub-prism 202 and the fourth sub-prism 204, and exits from the second side surfaces of the first sub-prism 201 and the third sub-prism 203. So arranged, the third side of each sub-prism has an angle of 45 ° with the plane of the substrate 10. The two linearly polarized lights with mutually perpendicular polarization directions, which are split by the polarizing prism 20, can be emitted from the second side surfaces of the first sub-prism 201 and the third sub-prism 203, and the propagation directions of the two linearly polarized lights with mutually perpendicular polarization directions can be arranged in parallel, so that the uniformity of the lights emitted from different positions of the display panel is ensured.

Illustratively, when the first optical layer 21 and the linear polarizer 23 are stacked, the embodiment of the present invention may correspond to the first linearly polarized light emitted from the first region 211 of the first optical layer 21 and the first region 231 of the linear polarizer 23, and correspond to the second linearly polarized light emitted from the second region 212 of the first optical layer 21 and the second region 232 of the linear polarizer 23.

For example, in the embodiment of the present invention, the structure of the linear polarizer 23 may have various designs, for example, a metal wire grid may be used or a polymer may be used to manufacture the linear polarizer. As an example in which the linear polarizer 23 is made of a material including a polymer film including a plurality of first polymer molecular chains aligned in the third direction D3 and extending in the fourth direction D4, the first region 231 of the linear polarizer 23 is made of a material including a polymer film such that the first region 231 of the linear polarizer 23 is permeable to linearly polarized light polarized in the third direction D3, i.e., such that an extension direction of a transmission axis of the first region 231 is parallel to the third direction D3. The polymer film includes a plurality of second polymer molecular chains extending in the third direction D3 and aligned in the fourth direction D4 in the second region 232 of the linear polarizer 23, so that the second region 232 of the linear polarizer 23 allows the linearly polarized light polarized in the fourth direction D4 to pass therethrough, i.e., so that the extending direction of the transmission axis of the second region 232 is parallel to the fourth direction D4.

Illustratively, the polymer film includes Polycarbonate (PC) or polyvinyl alcohol (PVA) or the like. In manufacturing the linear polarizer 23, a polymer film such as Polycarbonate (PC) or polyvinyl alcohol (PVA) may be stretched in a single axial direction to uniformly align molecules in the polymer film, thereby realizing a corresponding optical function.

As shown in fig. 5, the linear polarizer 23 includes a boundary region 230, and a first region 231 and a second region 232 are located at both sides of the boundary region 230. When the linear polarizer 23 shown in fig. 5 and the first and second optical layers 21 and 22 having the polarizing prism structure shown in fig. 6 are stacked on the side of the light emitting device layer 12 away from the substrate 10, the boundary region 230 corresponds to the interface between the second and third sub-prisms 202 and 203. To ensure that the above-described first linearly polarized light exiting from the first optical layer 21 is incident on the first region 231 of the linear polarizer 23 and the second linearly polarized light exiting from the first optical layer 21 is incident on the second region 232 of the linear polarizer 23.

In the embodiment of the present invention, the magneto-optical crystal layer 24 may be disposed on the side of the linear polarizer 23 remote from the substrate 10 in the thickness direction of the display panel. So set up, on the basis of guaranteeing the normal light-emitting of the light-emitting device that is located inside the display panel and the unable transmission of ambient light through linear polaroid 23 under the display mode, when the display panel is in the daylighting mode, can make magneto-optical crystal layer 24 have certain polarization angle through adjusting the magnetic field that applys on magneto-optical crystal layer 24, guarantee that the polarization direction of the ambient light that is incident to the inside of display panel under the daylighting mode when propagating to linear polaroid 23 is the same and can be transmitted through with the direction of the transmission axis of linear polaroid 23.

Alternatively, in the embodiment of the present invention, the polarization adjustment layer 23, the magneto-optical crystal layer 24, and the half wave plate 25 included in the polarization adjustment layer may be disposed in various manners. The following description will be given respectively:

as shown in fig. 8, fig. 8 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention, and the half-wave plate 25 is located on a side of the magneto-optical crystal layer 24 away from the light emitting device 120 along a thickness direction of the display panel. The light emitting device 120 is located in a light emitting device layer. Wherein the first direction D1 is parallel to the third direction D3, and the second direction D2 is parallel to the fourth direction D4; the angle between the extending direction of the fast axis of the half wave plate 25 and the first direction D1 is beta ₁ The method comprises the steps of carrying out a first treatment on the surface of the In the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a first predetermined angle α ₁ ，α ₁ And beta ₁ The method meets the following conditions: alpha ₁ ＝2β ₁ -90 °; and beta is ₁ ≠45°，β ₁ Not equal to 90 °. In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a second predetermined angle α ₂ ，α ₂ The method meets the following conditions: alpha ₂ ＝90°-2β ₁ Or, alpha ₂ ＝270°-2β ₁ 。

Specifically, in the first operation state, as shown in fig. 8, the light emitted by the light emitting device 120 passes through the first optical layer 21 and is divided into the linearly polarized light having the polarization direction along the first direction D1 and the linearly polarized light having the polarization direction along the second direction D2, and for more clearly explaining the change of the polarization direction of the light, the linearly polarized light polarized along the first direction D1 and the linearly polarized light polarized along the second direction D2 are named as the first pixel beam and the second pixel beam, respectively. The first pixel beam exits from a first region 211 of the first optical layer 21 and the second pixel beam exits from a second region 212 of the first optical layer 21.

Since the first direction D1 is parallel to the third direction D3 and the second direction D2 is parallel to the fourth direction D4, the first pixel beam is emitted through the first region 231 of the linear polarizer 23 and the second pixel beam is emitted through the second region 232 of the linear polarizer 23.

Then, the first pixel beam and the second pixel beam pass through the magneto-optical crystal layer 24, and the polarization direction is rotated clockwise by a first preset angle alpha ₁ So that the included angle between the polarization direction of the first pixel beam emitted through the magneto-optical crystal layer 24 and the first direction D1 becomes alpha ₁ The angle between the polarization direction of the second pixel beam emitted through the magneto-optical crystal layer 24 and the first direction D1 becomes 90 ° +α ₁ . In the case of α ₁ When less than 0 DEG, the polarization direction of the emergent light rotates clockwise by alpha ₁ Can be regarded as a clockwise rotation of 360 + alpha ₁ Alternatively, rotate counter-clockwise |alpha ₁ |。

Then, the first pixel beam passes through the half-wave plate 25, and in the embodiment of the present invention, the included angle σ between the polarization direction of the first pixel beam incident on the half-wave plate 25 and the first direction is α ₁ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₁ ，α ₁ And beta ₁ The method meets the following conditions: alpha ₁ ＝2β ₁ -90 °. Let σ=α ₁ ，β＝β ₁ And alpha ₁ ＝2β ₁ -90 ° substituted into formula (1) to obtain the calculation: delta=2β ₁ -(2β ₁ -90 °) =90°; i.e. after passing through the half wave plate 25, the first pixelThe polarization direction of the outgoing light beam is parallel to the second direction D2.

Similarly, for the second pixel beam, the angle σ between the polarization direction of the second pixel beam incident on the half-wave plate 25 and the first direction D1 is (90 ° +α ₁ ) σ=90° +α ₁ ，β＝β ₁ And alpha ₁ ＝2β ₁ -90 ° which is calculated by substituting it into formula (1): delta=2β ₁ -(90°+α ₁ ) =0°; that is, after passing through the half-wave plate 25, the polarization direction of the outgoing light of the second pixel beam is parallel to the first direction D1.

Then, the first pixel beam is directed to the first region 221 of the second optical layer 22, the second pixel beam is directed to the second region 222 of the second optical layer 22, and the two beams are converged into natural light after passing through the second optical layer 22.

It can be seen that the embodiments of the present invention are achieved by letting alpha ₁ ＝2β ₁ The light emitted by the light emitting device 120 in the first operation state can be ensured to normally exit the display panel by-90 degrees, and the light intensity of the display panel is ensured.

In the first operation state, as shown in fig. 9, fig. 9 is a schematic view of an external light incident into the display panel having the structure shown in fig. 8 in the first operation state, and when the external light is incident, the propagation direction of the external light is opposite to the propagation direction of the light emitted from the light emitting device 120 shown in fig. 8, and after the external light passes through the second optical layer 22, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. For illustration, the ambient light exiting through the first region 221 of the second optical layer 22 is hereinafter referred to as a first ambient light beam, and the ambient light exiting through the second region 222 of the second optical layer 22 is hereinafter referred to as a second ambient light beam.

After the first external beam passes through the half-wave plate 25, in the embodiment of the present invention, an included angle σ between the polarization direction of the first external beam incident on the half-wave plate 25 and the first direction D1 is 90 °, and σ=90° and β=β ₁ Substituting the formula (1) to calculate the following formula: delta=2β ₁ -90°＝α ₁ The method comprises the steps of carrying out a first treatment on the surface of the That is, after passing through the half wave plate 25, the angle between the polarization direction of the outgoing light of the first external light beam and the first direction D1 becomes α ₁ 。

After that, the first external beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light is rotated clockwise by a first preset angle alpha ₁ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 2α ₁ . In an embodiment of the invention, α ₁ ＝2β ₁ -90°；β ₁ ≠45°，β ₁ Not equal to 90 °; thus, alpha ₁ Not equal to 0 DEG, and alpha ₁ Not equal to 90 °, therefore 2α ₁ Not equal to 0 °, and 2α ₁ Not equal to 180 °; since the light transmission axis of the first region 231 of the linear polarizer 23 extends along the third direction D3, the third direction D3 is parallel to the first direction D1, and thus the first external light beam cannot pass through the first region 231 of the linear polarizer 23.

Similarly, after the second external beam passes through the half-wave plate 25, in the embodiment of the present invention, the included angle σ between the polarization direction of the second external beam incident on the half-wave plate 25 and the first direction D1 is 0 °, where σ=0° and β=β ₁ Substituting the formula (1) to calculate the following formula: delta=2β ₁ ＝90°+α ₁ The method comprises the steps of carrying out a first treatment on the surface of the That is, after passing through the half wave plate 25, the angle between the polarization direction of the outgoing light of the second external beam and the first direction D1 becomes 90 ° +α ₁ 。

The second external beam then passes through the magneto-optical crystal layer 24, and the polarization direction of the outgoing light is rotated clockwise by a first predetermined angle α ₁ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 ° +2α ₁ . In an embodiment of the invention, α ₁ ＝2β ₁ -90 °; and beta is ₁ ≠45°，β ₁ Not equal to 90 °; thus, alpha ₁ Not equal to 0 DEG, and alpha ₁ ≠90°，90°+2α ₁ Not equal to 90 °, and 90 ° +2α ₁ Not equal to 270 °; since the light transmission axis of the second region 232 of the linear polarizer 23 extends in the fourth direction D4, the fourth direction D4 is parallel to the second direction D2, and thus the second external light beam cannot pass through the second region 232 of the linear polarizer 23.

It can be seen that the embodiment of the present invention is implemented by letting α ₁ ＝2β ₁ -90 DEG, and let beta ₁ ≠45°，β ₁ Not equal to 90 °; the external environment light can be ensured to be stopped at the linear polarizer 23 in the process of entering the display panel in the normal display mode, namely, the external environment light can not enter the display panel through the linear polarizer 23, so that the reflection of the environment light by some metal wires or electrodes in the display panel is avoided, the intensity of the reflected environment light is reduced, and the contrast of the display panel can be improved.

Similarly, when the display panel is operated in the second operation state, the external light propagates from the outside of the display panel to the inside of the display panel, as shown in fig. 10, fig. 10 is a schematic view of an external light ray in the display panel having the structure shown in fig. 8 in the second operation state, and similarly to fig. 9, the external light ray passes through the second optical layer 22, and then, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. Light exiting through the first region 221 of the second optical layer 22 will be hereinafter referred to as a first external beam, and light exiting through the second region 222 of the second optical layer 22 will be referred to as a second external beam.

After the first external light beam passes through the half-wave plate 25, in the embodiment of the present invention, an included angle σ between the polarization direction of the first external light beam incident on the half-wave plate 25 and the first direction is 90 °, and an included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₁ . Let σ=90° and β=β ₁ Substituting the formula (1) to calculate the following formula: delta=2β ₁ -90°＝α ₁ The method comprises the steps of carrying out a first treatment on the surface of the That is, after passing through the half wave plate 25, the angle between the polarization direction of the outgoing light of the first external light beam and the first direction D1 becomes α ₁ ＝2β ₁ -90°。

After that, the first external beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light is rotated clockwise by a second preset angle alpha ₂ The angle between the polarization direction of the outgoing light and the first direction D1 becomes α ₁ +α ₂ ＝2β ₁ -90°+α ₂ . In an embodiment of the invention, α ₂ ＝90°-2β ₁ Or, alpha ₂ ＝270°-2β ₁ 。

At alpha ₂ ＝90°-2β ₁ When passing through the magneto-optical crystal layer 24, the polarization direction of the outgoing light has an angle of 0 ° with the first direction D1. At alpha ₂ ＝270°-2β ₁ When passing through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is 180 ° from the first direction D1. Both of the above cases are parallel to the direction of the transmission axis of the first region 231 of the linear polarizer 23. Accordingly, the first external light beam can pass through the first region 231 of the linear polarizer 23.

Similarly, after the second external beam passes through the half-wave plate 25, in the embodiment of the present invention, the included angle σ between the polarization direction of the second external beam incident on the half-wave plate 25 and the first direction is 0 °, and the included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₁ . Let σ=0° and β=β ₁ Substituting the formula (1) to calculate the following formula: delta=2β ₁ The method comprises the steps of carrying out a first treatment on the surface of the That is, after passing through the half wave plate 25, the angle between the polarization direction of the outgoing light of the first external light beam and the first direction D1 becomes 2β ₁ ＝90°+α ₁ 。

The second external beam then passes through the magneto-optical crystal layer 24 and the polarization direction of the outgoing light is rotated clockwise by alpha ₂ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 2β ₁ +α ₂ ＝90°+α ₁ +α ₂ . In an embodiment of the invention, α ₂ ＝90°-2β ₁ Or, alpha ₂ ＝270°-2β ₁ . At alpha ₂ ＝90°-2β ₁ At this time, the angle between the polarization direction of the outgoing light after passing through the magneto-optical crystal layer 24 and the first direction D1 becomes 90 °. At alpha ₂ ＝270°-2β ₁ When passing through the magneto-optical crystal layer 24, the polarization direction of the outgoing light has an included angle of 270 ° with the first direction D1. Both of the above cases are parallel to the direction of the transmission axis of the second region 232 of the linear polarizer 23. Accordingly, the second external light beam can pass through the second region 232 of the linear polarizer 23 to reach the first optical layer 21.

Then, the first external light beam and the second external light beam are emitted through the first optical layer 21 to become natural light, which can enter the light sensing device.

It can be seen that the embodiment of the present invention is implemented by letting α ₂ ＝90°-2β ₁ Or, alpha ₂ ＝270°-2β ₁ External light can be ensured to be smoothly incident to the light sensing device in the process of incidence into the display panel in the lighting mode, and normal lighting of the light sensing device can be ensured. Wherein at alpha ₂ ＝90°-2β ₁ When alpha is ₁ +α ₂ As can be seen, in the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a first preset angle α ₁ In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counter-clockwise by a first predetermined angle α ₁ 。

The light sensing device may be a camera or an ambient light level sensor for detecting the ambient light level, for example.

Alternatively, as shown in fig. 11, fig. 11 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention, and the half-wave plate 25 is located on a side of the linear polarizer 23 close to the substrate 10 along the thickness direction of the display panel. In the display panel having the structure shown in fig. 11, the angle β between the extending direction of the fast axis 250 of the half-wave plate 25 and the first direction D1 is ₂ The method comprises the steps of carrying out a first treatment on the surface of the In the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a third predetermined angle α ₃ ，α ₃ And beta ₂ The method meets the following conditions: alpha ₃ ＝90°-2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the And beta is ₂ ≠45°，β ₂ Not equal to 0 °; the included angle between the third direction D3 and the first direction D1 is gamma ₁ ，γ ₁ And beta ₂ The method meets the following conditions: gamma ray ₁ ＝2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the The included angle between the fourth direction D4 and the first direction D1 is gamma ₂ ，γ ₂ And beta ₂ The method meets the following conditions: gamma ray ₂ ＝2β ₂ -90 °. In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a fourth predetermined angle α ₄ ，α ₄ The method meets the following conditions: alpha ₄ ＝2β ₂ -90 °. I.e. alpha ₃ +α ₄ As can be seen, in the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a third preset angle α ₃ In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counter-clockwise by a third predetermined angle α ₃ 。

Specifically, as shown in fig. 11, in the first operation state, the light emitted from the light emitting device 120 is divided into the first pixel beam and the second pixel beam after passing through the first optical layer 21. The first pixel beam is linearly polarized light with a polarization direction along a first direction D1, and the second pixel beam is linearly polarized light with a polarization direction along a second direction D2. The first pixel beam exits from a first region 211 of the first optical layer 21 and the second pixel beam exits from a second region 212 of the first optical layer.

Then, the first pixel beam passes through the half-wave plate 25, and in the embodiment of the present invention, the included angle σ between the polarization direction of the first pixel beam incident on the half-wave plate 25 and the first direction is 0 °, and the included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₂ Let σ=0 °, β=β ₂ Substituting formula (1) to calculate delta=2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the That is, the angle between the polarization direction of the first pixel beam emitted from the half-wave plate 25 and the first direction D1 is 2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the Then, the first pixel beam is directed to the first region 231 of the linear polarizer 23. In the embodiment of the present invention, the included angle between the third direction D3 and the first direction D1 is γ ₁ ，γ ₁ And beta ₂ The method meets the following conditions: gamma ray ₁ ＝2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the Accordingly, the first pixel beam can pass through the first region 231 of the linear polarizer 23.

In the embodiment of the present invention, the angle σ between the polarization direction of the second pixel beam incident on the half-wave plate 25 and the first direction is 90 °, and the angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₂ Let σ=90°, β=β ₂ Substituting formula (1) to calculate delta=2β ₂ -90 °; namely, the first one emitted from the half-wave plate 25The included angle between the polarization direction of the two pixel beams and the first direction D1 is 2 beta ₂ -90 °; then, the second pixel beam is directed to the second region 232 of the linear polarizer 23, and in the embodiment of the present invention, the angle between the fourth direction D4 and the first direction D1 is γ ₂ ，γ ₂ And beta ₂ The method meets the following conditions: gamma ray ₂ ＝2β ₂ -90 °. Accordingly, the second pixel beam can pass through the second region 232 of the linear polarizer 23.

Then, the first pixel beam passes through the magneto-optical crystal layer 24, and the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a third preset angle α ₃ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 2β ₂ +α ₃ The method comprises the steps of carrying out a first treatment on the surface of the In an embodiment of the invention, α ₃ ＝90°-2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the polarization direction of the first pixel beam emitted through the magneto-optical crystal layer 24 is parallel to the second direction D2.

The second pixel beam passes through the magneto-optical crystal layer 24, and the angle between the polarization direction of the emergent light and the first direction D1 becomes 2β ₂ -90°+α ₃ Binding to alpha ₃ ＝90°-2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the It is possible to obtain that the polarization direction of the second pixel beam emitted through the magneto-optical crystal layer 24 is parallel to the first direction D1.

Subsequently, the first pixel beam and the second pixel beam emit natural light after passing through the second optical layer 22.

It can be seen that the embodiments of the present invention are achieved by letting alpha ₃ ＝90°-2β ₂ ；γ ₁ ＝2β ₂ ，γ ₂ ＝2β ₂ The light emission of the light emitting device 120 is not affected in the normal display mode, and the light emission intensity of the display panel is ensured by-90 °.

In the first operation state, as shown in fig. 12, fig. 12 is a schematic view of an external light incident into the display panel having the structure shown in fig. 11 in the first operation state, and when the external light is incident, the propagation direction of the external light is opposite to the propagation direction of the light emitted from the light emitting device shown in fig. 11, and after the external light passes through the second optical layer 22, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. The ambient light exiting through the first region 221 of the second optical layer 22 will be referred to as a first ambient light beam and the ambient light exiting through the second region 222 of the second optical layer 22 will be referred to as a second ambient light beam.

After the first external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a third preset angle alpha ₃ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 ° +α ₃ In the embodiment of the invention, alpha ₃ ＝90°-2β ₂ Therefore, the included angle between the polarization direction of the light emitted through the magneto-optical crystal layer 24 and the first direction D1 is 180-2β ₂ 。

After that, the first external beam passes through the first region 231 of the linear polarizer 23 because the angle gamma between the direction D3 of the transmission axis of the first region 231 and the first direction D1 ₁ Is 2 beta ₂ If the light emitted through the magneto-optical crystal layer 24 is to pass through the first region 231 of the linear polarizer 23, 180 ° -2β is satisfied ₂ ＝γ ₁ ＝2β ₂ I.e. beta ₂ =45°. And due to beta ₂ ≠45°，β ₂ Not equal to 0 deg., so that the first ambient light beam cannot pass through the first region 231 of the linear polarizer 23.

After the second external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a third preset angle α ₃ The angle between the polarization direction of the outgoing light and the first direction D1 becomes α ₃ ＝90°-2β ₂ . After that, the second external beam passes through the second region 232 of the linear polarizer 23 because the angle gamma between the direction D4 of the transmission axis of the second region 232 and the first direction D1 ₂ Is 2 beta ₂ -90 °, if the light exiting through the magneto-optical crystal layer 24 is to pass through the second region 232 of the linear polarizer 23, then 90 ° -2 β is to be satisfied ₂ ＝γ ₂ ＝2β ₂ -90 °, i.e. beta ₂ =45°. And due to beta ₂ ≠45°，β ₂ Not equal to 0 °; therefore, the second external light beam cannot pass through the second region 232 of the linear polarizer 23.

It can be seen that the embodiments of the present invention are achieved by letting alpha ₃ ＝90°-2β ₂ ，γ ₁ ＝2β ₂ ，γ ₂ ＝2β ₂ -90 DEG, and let beta ₂ ≠45°，β ₂ Not equal to 0 °, the external ambient light can be ensured to be stopped at the linear polarizer 23 in the process of entering the display panel in the normal display mode, that is, the external ambient light cannot enter the display panel through the linear polarizer 23, so that the ambient light is prevented from being reflected by some metal wires or electrodes in the display panel, the intensity of the reflected ambient light is reduced, and the contrast of the display panel can be improved.

Similarly, when the display panel is operated in the second operation state, the external light propagates from the outside of the display panel to the inside of the display panel, as shown in fig. 13, fig. 13 is a schematic view showing that the external light is directed into the display panel having the structure shown in fig. 11 in the second operation state, and similarly to the case shown in fig. 12, the external light passes through the second optical layer 22, and then, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. Light exiting through the first region 221 of the second optical layer 22 will be hereinafter referred to as a first external beam, and light exiting through the second region 222 of the second optical layer 22 will be referred to as a second external beam.

After the first external light beam passes through the magneto-optical crystal layer 24, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a fourth preset angle alpha ₄ The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 ° +α ₄ . Then, the first external beam passes through the first region 231 of the linear polarizer 23, and the angle between the transmission axis of the first region 231 and the first direction D1 is gamma ₁ Is 2 beta ₂ In the embodiment of the invention, alpha ₄ ＝2β ₂ -90 °, or α ₄ ＝2β ₂ +90°; that is, the angle between the polarization direction of the second external light beam after passing through the magneto-optical crystal layer 24 and the transmission axis of the first region 231 of the linear polarizer 23 is 0 ° or 180 °, and thus the first external light beam may pass through the first region 231 of the linear polarizer 23.

Similarly, after the second external light beam passes through the magneto-optical crystal layer 24, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a fourth predetermined angle α ₄ The angle between the polarization direction of the outgoing light and the first direction D1 becomes α ₄ . Then, the second external beam passes through the second region 232 of the linear polarizer 23, and the angle gamma between the transmission axis of the second region 232 and the first direction D1 ₂ Is 2 beta ₂ -90 °, in the present embodiment, α ₄ ＝2β ₂ -90 °, or α ₄ ＝2β ₂ +90°; that is, the angle between the polarization direction of the second external light beam after passing through the magneto-optical crystal layer 24 and the transmission axis of the second region 232 of the linear polarizer 23 is 0 ° or 180 °, and thus the second external light beam can pass through the second region 232 of the linear polarizer 23.

The first ambient light beam then passes through the half wave plate 25. In the embodiment of the present invention, the included angle σ between the polarization direction of the first external beam incident on the half wave plate 25 and the first direction is 90 ° +α ₄ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₂ σ=90° +α ₄ ，β＝β ₂ Substituting formula (1) to calculate delta=2β ₂ -90°-α ₄ And also because of alpha ₄ ＝2β ₂ -90 DEG or alpha ₄ ＝2β ₂ +90°, so δ=2β ₂ -90°-α ₄ =0° or δ=2β ₂ -90°-α ₄ The polarization direction of the first external beam after passing through the half wave plate 25 is parallel to the first direction.

Likewise, the second external beam passes through the half wave plate 25. In the embodiment of the present invention, the included angle σ between the polarization direction of the second external beam incident on the half-wave plate 25 and the first direction is α ₄ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₂ Let σ=α ₄ ，β＝β ₂ Substituting formula (1) to calculate delta=2β ₂ -α ₄ And also because of alpha ₄ ＝2β ₂ -90 DEG or alpha ₄ ＝2β ₂ +90°, so δ=2β ₂ -90°-α ₄ =90° or δ=2β ₂ -90°-α ₄ The polarization direction of the first external beam after passing through the half wave plate 25 is parallel to the second direction.

It can be seen that the embodiment of the present invention is implemented by letting α ₄ ＝2β ₂ -90 °, or α ₄ ＝2β ₂ +90°; the external light can be smoothly incident to the light sensing device in the process of incidence into the display panel in the lighting mode, and normal lighting of the light sensing device can be ensured. Wherein at alpha ₄ ＝2β ₂ -90 DEG, alpha ₃ +α ₄ As can be seen, in the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a third preset angle α ₃ In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counter-clockwise by a third predetermined angle α ₃ 。

Alternatively, as shown in fig. 14, fig. 14 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention, in which the half wave plate 25 is located on a side of the magneto-optical crystal layer 24 near the light emitting device 120 along the thickness direction of the display panel. That is, the positions of the magneto-optical crystal layer 24 and the half wave plate 25 in fig. 8 are reversed. In the display panel having the structure shown in fig. 14, the first direction D1 is parallel to the third direction D3, and the second direction D2 is parallel to the fourth direction D4; the angle between the extending direction of the fast axis 250 of the half wave plate 25 and the first direction D1 is beta ₃ The method comprises the steps of carrying out a first treatment on the surface of the In the first operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a fifth predetermined angle α ₅ ，α ₅ And beta ₃ The method meets the following conditions: alpha ₅ ＝90°-2β ₃ The method comprises the steps of carrying out a first treatment on the surface of the And beta is ₃ ≠45°，β ₃ Not equal to 90 °; in the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a sixth predetermined angle α ₆ ，α ₆ The method meets the following conditions: alpha ₆ ＝2β ₃ -90 °; alternatively, alpha ₆ ＝2β ₃ +90°。

Specifically, in the first operation state, similarly to fig. 8, after the light emitted from the light emitting device 120 passes through the first optical layer 21, the first polarized light is emitted from the first region 211 of the first optical layer 21, and the second polarized light is emitted from the second region 212 of the first optical layer 21. The polarization direction of the first polarized light is the first direction D1, and the polarization direction of the second polarized light is the second direction D2. To more clearly illustrate the change in the polarization direction of the light rays, the linearly polarized light polarized in the first direction D1 and the linearly polarized light polarized in the second direction D2 will be hereinafter still named as first pixel light beam and second pixel light beam, respectively. The first pixel beam exits from a first region 211 of the first optical layer 21 and the second pixel beam exits from a second region 212 of the first optical layer 21.

Since the first direction D1 is parallel to the third direction D3 and the second direction D2 is parallel to the fourth direction D4, the first pixel beam exits through the first region 231 of the linear polarizer 23 and the second pixel beam exits through the second region 232 of the linear polarizer 23.

Then, the first pixel beam passes through the half-wave plate 25, and in the embodiment of the present invention, the included angle σ between the polarization direction of the first pixel beam incident on the half-wave plate 25 and the first direction is 0 °, and the included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₃ Let σ=0 °, β=β ₃ Substituting formula (1) to calculate delta=2β ₃ The method comprises the steps of carrying out a first treatment on the surface of the That is, the included angle between the polarization direction of the first pixel beam after exiting through the half-wave plate 25 and the first direction D1 is 2β ₃ 。

Then, the first pixel beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light is rotated clockwise by a fifth preset angle alpha ₅ So that the included angle between the polarization direction of the first pixel beam emitted through the magneto-optical crystal layer 24 and the first direction D1 becomes 2β ₃ +α ₅ In the embodiment of the invention, alpha ₅ ＝90°-2β ₃ The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the angle between the polarization direction of the first pixel beam emitted through the magneto-optical crystal layer 24 and the first direction D1 is 90 °. In fig. 14, beta ₃ ＞45°，α ₅ < 0 deg. is used as an illustration.

Similarly, for the second pixel beam, when the second pixel beam passes through the half-wave plate 25, the angle σ between the polarization direction of the first pixel beam incident on the half-wave plate 25 and the first direction is 90 °, and the angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β ₃ Let σ=90°, β=β ₃ Substituting formula (1) to calculate delta=2β ₃ -90 °; that is, the angle between the polarization direction of the light emitted from the half-wave plate 25 and the first direction D1 is 2β ₃ -90°。

The second pixel beam then passes through the magneto-optical crystal layer 24, and the polarization direction is rotated clockwise by a fifth predetermined angle α ₅ So that the included angle between the polarization direction of the second pixel beam emitted through the magneto-optical crystal layer 24 and the first direction D1 becomes 2β ₃ -90°+α ₅ In the embodiment of the invention, alpha ₅ ＝90°-2β ₃ The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the polarization direction of the outgoing light is parallel to the first direction D1.

It can be seen that the embodiments of the present invention are achieved by letting alpha ₅ ＝90°-2β ₃ It is possible to ensure that the light emission of the light emitting device 120 is not affected in the normal display mode, and the light emission intensity of the display panel is ensured.

In the first operation state, as shown in fig. 15, fig. 15 is a schematic view of an external light incident into the display panel having the structure shown in fig. 14 in the first operation state, and when the external light is incident, the propagation direction of the external light is opposite to the propagation direction of the light emitted from the light emitting device 120 shown in fig. 14, and after the external light passes through the second optical layer 22, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. For illustration, the ambient light exiting the first region 221 of the second optical layer 22 will be hereinafter referred to as a first ambient light beam, and the ambient light exiting the second region 222 of the second optical layer 22 will be referred to as a second ambient light beam.

After the first external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a fifth preset angle α ₅ The clip angle with the first direction D1 becomes 90 ° +α ₅ . After the second external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a fifth preset angle α ₅ The pinch angle with the first direction D1 becomes α ₅ 。

After that, the first external beam passes through the half-wave plate 25, and in the embodiment of the present invention, the included angle σ between the polarization direction of the first external beam incident on the half-wave plate 25 and the first direction is 90 ° +α ₅ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₃ σ=90° +α ₅ ，β＝β ₃ Substituting formula (1) to calculate delta=2β ₃ -α ₅ -90 °. In an embodiment of the invention, α ₅ ＝90°-2β ₃ Therefore, the angle between the polarization direction of the light emitted through the half-wave plate 25 and the first direction D1 is 4β ₃ -180 °, in an embodiment of the invention β ₃ ≠45°，β ₃ Not equal to 90 °, and therefore the angle between the polarization direction of the light exiting through the half wave plate 25 and the first direction D1 is not equal to 0 °, nor is it equal to 180 °, i.e., the direction of the exit light is different from the direction of the transmission axis of the first region 231 of the linear polarizer 23, and cannot exit.

Similarly, when the second external beam passes through the half-wave plate 25, in the embodiment of the present invention, the included angle σ between the polarization direction of the second external beam incident on the half-wave plate 25 and the first direction is α ₅ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₃ Let σ=α ₅ ，β＝β ₃ Substituting formula (1) to calculate delta=2β ₃ -α ₅ . In an embodiment of the invention, α ₅ ＝90°-2β ₃ Therefore, the included angle between the polarization direction of the light emitted through the half-wave plate and the first direction D1 is 4β ₃ -90 °, in the present embodiment β ₃ ≠45°，β ₃ Not equal to 90 °, so that the angle between the polarization direction of the light exiting through the half-wave plate and the first direction D1 is not equal to 90 °, nor is it equal to 270 °, i.e. the direction of the exiting light is different from the direction of the transmission axis of the second region 232 of the linear polarizer 23, and cannot exit.

It can be seen that the embodiment of the present invention is achieved by letting α ₅ ＝90°-2β ₃ And let beta ₃ ≠45°，β ₃ Not equal to 90 degrees, the external environment light can be ensured to be stopped at the linear polarizer 23 in the process of entering the display panel in the normal display mode, namely, the external environment light cannot enter the display panel through the linear polarizer 23, so that the reflection of the environment light by some metal wires or electrodes in the display panel is avoided, the intensity of the reflected environment light is reduced, and the contrast of the display panel can be improved.

Similarly, when the display panel is operated in the second operation state, the external light propagates from the outside of the display panel to the inside of the display panel, as shown in fig. 16, fig. 16 is a schematic view showing that the external light is directed into the display panel having the structure shown in fig. 14 in the second operation state, and similarly to fig. 15, the external light passes through the second optical layer 22, and then, the linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and the linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. Light exiting through the first region 221 of the second optical layer 22 will be hereinafter referred to as a first external beam, and light exiting through the second region 222 of the second optical layer 22 will be referred to as a second external beam.

After the first external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a sixth preset angle α ₆ The included angle between the polarization direction of the outgoing light and the first direction D1 is 90 degrees+alpha ₆ . After the second external beam passes through the magneto-optical crystal layer 24, the polarization direction of the outgoing light is rotated clockwise by a sixth preset angle α ₆ The included angle between the polarization direction of the emergent light and the first direction D1 is alpha ₆ 。

Then, the first external beam passes through one halfThe wave plate 25, in the embodiment of the present invention, the included angle σ between the polarization direction of the second pixel beam incident on the half wave plate 25 and the first direction is 90++α ₆ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₃ σ=90° +α ₆ ，β＝β ₃ Substituting formula (1) to calculate delta=2β ₃ -α ₆ -90 ° in the present embodiment, α ₆ ＝2β ₃ -90 °, or α ₆ ＝2β ₃ +90°, that is, an angle between the polarization direction of the first external light beam and the transmission axis of the first region 231 of the linear polarizer 23 is 0 ° or 180 °, and thus the first external light beam can transmit through the first region 231 of the linear polarizer 23.

Similarly, the second external beam passes through the half-wave plate 25, and in the embodiment of the present invention, the included angle σ between the polarization direction of the second pixel beam incident on the half-wave plate 25 and the first direction is α ₆ The angle beta between the optical axis 250 of the half wave plate and the first direction D1 is beta ₃ Let σ=α ₆ ，β＝β ₃ Substituting formula (1) to calculate delta=2β ₃ -α ₆ . In an embodiment of the invention, α ₆ ＝2β ₃ -90 °, or α ₆ ＝2β ₃ +90°, that is, an angle between the polarization direction of the second external beam and the transmission axis of the second region 232 of the linear polarizer 23 is 0 ° or 180 °, and thus the second external beam can transmit the second region 232 of the linear polarizer 23.

Then, the first external light beam and the second external light beam are emitted through the first optical layer 21 to become natural light, and can enter the light sensing device, so that normal lighting of the light sensing device is ensured.

It can be seen that the embodiment of the present invention is achieved by letting α ₆ ＝2β ₃ -90 °, or α ₆ ＝2β ₃ The light source can ensure that external light can smoothly enter the light sensing device in the process of entering the display panel in a lighting mode by +90°, and can ensure normal lighting of the light sensing device. Wherein at alpha ₆ ＝2β ₃ -90 DEG, alpha ₅ +α ₆ ＝0The degree can be regarded as a fifth preset angle alpha of clockwise rotation of the polarization direction of the linearly polarized light by the magneto-optical crystal layer 24 in the first operating state ₅ In the second operating state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counter-clockwise by a fifth predetermined angle α ₅ 。

The embodiment of the invention also provides a display device, as shown in fig. 17, and fig. 17 is a schematic diagram of the display device according to the embodiment of the invention, where the display device includes the display panel 100 described above. The specific structure of the display panel 100 is described in detail in the above embodiments, and will not be described here again. Of course, the display device shown in fig. 17 is only a schematic illustration, and the display device may be any electronic apparatus having a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.

As shown in fig. 17, the front projection of the light sensing device 3 on the plane of the display panel 100 is located in the lighting area AA2.

Optionally, the light sensing device includes an ambient light sensor for sensing ambient light intensity, a distance sensor for sensing a distance between a user and the display panel, and a camera module for photographing, a fingerprint identification module for identification, an iris sensor, and the like.

The embodiment of the invention also provides a control method of the display panel, and the specific structure of the display panel is described in detail in the foregoing, and is not described herein again.

Referring to fig. 8 and 10, fig. 11 and 13, and fig. 14 and 16, the operation states of the display panel include a first operation state and a second operation state; the control method comprises the following steps:

in a first operating state, a first magnetic field is applied to the magneto-optical crystal layer 24, and under the first magnetic field, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a first preset angle; so as to ensure that the light emitted by the light-emitting device can normally emit out of the display panel and ensure the light intensity of the display panel; and the external environment light can not be incident into the display panel through the linear polaroid, so that the reflection of the environment light by some metal wires or electrodes in the display panel is avoided, the intensity of the reflected environment light is reduced, and the contrast ratio of the display panel can be improved.

In a second operating state, a second magnetic field is applied to the magneto-optical crystal layer 24, and under the second magnetic field, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a second preset angle; so as to ensure that external light can be smoothly incident to the light sensing device in the process of incidence into the display panel, and ensure the normal lighting of the light sensing device.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. A display panel comprising at least one polarization adjustment film group, the polarization adjustment film group comprising:

a first optical layer and a second optical layer stacked in a thickness direction of the display panel; the first optical layer and the second optical layer are capable of decomposing incident natural light into first linearly polarized light and second linearly polarized light that are spatially separated, and synthesizing the incident first linearly polarized light and the second linearly polarized light into natural light; the polarization direction of the first linearly polarized light is a first direction, and the polarization direction of the second linearly polarized light is a second direction; the first direction and the second direction are orthogonal;

the linear polarizer comprises a first area and a second area; in the first region, a transmission axis of the linear polarizer extends along a third direction; in the second region, a transmission axis of the linear polarizer extends in a fourth direction; the third direction and the fourth direction are orthogonal;

The display panel comprises a substrate base plate, and the magneto-optical crystal layer is positioned at one side of the linear polaroid far away from the substrate base plate along the thickness direction of the display panel;

wherein, the liquid crystal display device comprises a liquid crystal display device,

the half wave plate is positioned on one side of the magneto-optical crystal layer away from the substrate base plate along the thickness direction of the display panel; the first direction is parallel to the third direction, and the second direction is parallel to the fourth direction; the included angle between the extending direction of the fast axis of the half wave plate and the first direction is beta ₁ The method comprises the steps of carrying out a first treatment on the surface of the In a first working state, the magneto-optical crystal layer rotates the polarization direction of linearly polarized light by a first preset angle alpha ₁ ，α ₁ And beta ₁ The method meets the following conditions: alpha ₁ ＝2β ₁ -90 °; and beta is ₁ ≠45°，β ₁ Not equal to 90 °; in a second working state, the magneto-optical crystal layer rotates the polarization direction of the linearly polarized light by a second preset angle alpha ₂ ，α ₂ The method meets the following conditions: alpha ₂ ＝90°-2β ₁ Or, alpha ₂ ＝270°-2β ₁ ；

Or alternatively, the process may be performed,

the half wave plate is positioned on one side of the linear polaroid, which is close to the substrate base plate, along the thickness direction of the display panel; the included angle between the extending direction of the fast axis of the half wave plate and the first direction is beta ₂ The method comprises the steps of carrying out a first treatment on the surface of the In the first working state, the magneto-optical crystal layer rotates the polarization direction of the linearly polarized light by a third preset angle alpha ₃ ，α ₃ And beta ₂ The method meets the following conditions: alpha ₃ ＝90°-2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the And beta is ₂ ≠45°，β ₂ Not equal to 0 °; in the second working state, the magneto-optical crystal layer rotates the polarization direction of the linearly polarized light by a fourth preset angle alpha ₄ ，α ₄ The method meets the following conditions: alpha ₄ ＝2β ₂ -90 °; or, alpha ₄ ＝2β ₂ +90°; the included angle between the third direction and the first direction is gamma ₁ ，γ ₁ And beta ₂ The method meets the following conditions: gamma ray ₁ ＝2β ₂ The method comprises the steps of carrying out a first treatment on the surface of the The included angle between the fourth direction and the first direction is gamma ₂ ，γ ₂ And beta ₂ The method meets the following conditions: gamma ray ₂ ＝2β ₂ -90°；

Or alternatively, the process may be performed,

the half wave plate is positioned on one side of the magneto-optical crystal layer, which is close to the substrate base plate, along the thickness direction of the display panel; the first direction is parallel to the third direction, and the second direction is parallel to the fourth direction; the included angle between the extending direction of the fast axis of the half wave plate and the first direction is beta ₃ The method comprises the steps of carrying out a first treatment on the surface of the In the first working state, the magneto-optical crystal layer rotates the polarization direction of the linearly polarized light by a fifth preset angle alpha ₅ ，α ₅ And beta ₃ The method meets the following conditions: alpha ₅ ＝90°-2β ₃ The method comprises the steps of carrying out a first treatment on the surface of the And beta is ₃ ≠45°，β ₃ Not equal to 90 °; in the second working state, the magneto-optical crystal layer rotates the polarization direction of the linearly polarized light by a sixth preset angle alpha ₆ ，α ₆ The method meets the following conditions: alpha ₆ ＝2β ₃ -90 °, or α ₆ ＝2β ₃ +90°。

2. The display panel of claim 1, wherein the display panel comprises,

the first optical layer and the second optical layer both comprise polarizing prisms, and the polarizing prisms are cuboid in shape;

The polarizing prism comprises a first sub-prism, a second sub-prism, a third sub-prism and a fourth sub-prism which are arranged in an adhesive manner, wherein the first sub-prism, the second sub-prism, the third sub-prism and the fourth sub-prism are triangular prisms with the same size, and the bottom surface of each triangular prism is an isosceles right triangle; the side surfaces of the triangular prism comprise a first side surface, a second side surface and a third side surface, wherein an included angle between the first side surface and the second side surface is a right angle;

in the polarizing prism:

the first side surface of the first sub-prism and the first side surface of the second sub-prism are parallel to each other;

the second side surface of the first sub-prism and the second side surface of the second sub-prism are parallel to each other;

the third side surface of the first sub-prism and the third side surface of the second sub-prism are bonded through an adhesive layer;

the first side surface of the second sub-prism and the first side surface of the third sub-prism are bonded through an adhesive layer;

the second side of the second sub-prism and the second side of the third sub-prism are parallel to each other;

the third side surface of the second sub-prism and the third side surface of the third sub-prism are parallel to each other;

The first side surface of the third sub-prism and the first side surface of the fourth sub-prism are parallel to each other;

the second side of the third sub-prism and the second side of the fourth sub-prism are parallel to each other;

and the third side surface of the third sub-prism and the third side surface of the fourth sub-prism are bonded through an adhesive layer.

3. The display panel of claim 2, wherein the display panel comprises,

the first linearly polarized light corresponds to the first region, and the second linearly polarized light corresponds to the second region.

4. The display panel according to claim 3, wherein,

the linear polarizer includes a polymer film;

in the first region, the polymer film includes a plurality of first polymer molecular chains arranged in the third direction and extending in the fourth direction;

in the second region, the polymer film includes a plurality of second polymer molecular chains extending in the third direction and aligned in the fourth direction;

the linear polaroid comprises a demarcation region, and the first region and the second region are positioned at two sides of the demarcation region;

the demarcation region corresponds to an interface between the second sub-prism and the third sub-prism.

5. The display panel of claim 1, wherein the display panel comprises,

the number of the polarization adjustment film groups is multiple, and the polarization adjustment film groups are arrayed in a plane parallel to the plane of the substrate.

6. The display panel of claim 1, wherein the display panel comprises,

the material of the magneto-optical crystal layer comprises any one of magnesian, iron aluminum garnet, manganese aluminum garnet, lime iron garnet, lime chromium garnet and yttrium iron garnet.

7. A display device, characterized in that the display device comprises the display panel according to any one of claims 1-6.

8. A control method of a display panel for controlling the display panel according to any one of claims 1 to 6, wherein the display panel comprises at least one polarization adjustment film group comprising:

the control method comprises the following steps:

when the half wave plate is positioned on one side of the magneto-optical crystal layer away from the substrate base plate along the thickness direction of the display panel, a first magnetic field is applied to the magneto-optical crystal layer in the first working state, and the polarization direction of linearly polarized light is rotated by the first preset angle alpha by the magneto-optical crystal layer in the first magnetic field ₁ The method comprises the steps of carrying out a first treatment on the surface of the In the second working state, a second magnetic field is applied to the magneto-optical crystal layer, and under the second magnetic field, the magneto-optical crystal layer rotates the polarization direction of linearly polarized light by the second preset angle alpha ₂ ；

Or alternatively, the process may be performed,

when the half wave plate is positioned on one side of the linear polarizer, which is close to the substrate base plate, along the thickness direction of the display panel, a third magnetic field is applied to the magneto-optical crystal layer in the first working state, and the polarization direction of linearly polarized light is rotated by the magneto-optical crystal layer by the third preset angle alpha under the third magnetic field ₃ The method comprises the steps of carrying out a first treatment on the surface of the In the second working state, a fourth magnetic field is applied to the magneto-optical crystal layer, and under the fourth magnetic field, the magneto-optical crystal layer rotates the polarization direction of linearly polarized light by the fourth preset angle alpha ₄ ；

Or alternatively, the process may be performed,

when the half wave plate is positioned on one side of the magneto-optical crystal layer close to the substrate base plate along the thickness direction of the display panel, the first working state is thatA fifth magnetic field is applied to the magneto-optical crystal layer, and the polarization direction of the linearly polarized light is rotated by the fifth preset angle alpha under the fifth magnetic field ₅ The method comprises the steps of carrying out a first treatment on the surface of the In the second working state, a sixth magnetic field is applied to the magneto-optical crystal layer, and under the sixth magnetic field, the magneto-optical crystal layer rotates the polarization direction of linearly polarized light by the sixth preset angle alpha ₆ 。