CN113093412A

CN113093412A - Display panel, control method and display device

Info

Publication number: CN113093412A
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: 2021-07-09
Anticipated expiration: 2041-04-12
Also published as: CN113093412B

Abstract

The invention provides a display panel, a control method and a display device, relates to the technical field of display, and aims to improve the light transmittance of a position, corresponding to a light sensing device, in the display panel and improve the display effect of 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 incident natural light into first linearly polarized light and second linearly polarized light which are separated in space, and the first linearly polarized light and the second linearly polarized light which are incident are synthesized 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 and second regions, the transmission axes of the linear polarizers extend in the third and fourth directions, respectively.

Description

Display panel, control method and display device

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

With the increasing demand of users for diversified uses of display devices, various sensors are currently mounted on a display panel during the design process of the display panel. The sensor comprises a light sensitive light sensing device.

For satisfying the design requirement that the user accounts for the high screen of display device simultaneously, the design that sets up the light sense device corresponding display panel's display area has appeared at present: for example, in the under-screen camera technology, the camera is arranged on one side of the sub-pixel located in the display area, which is away from the light emitting side. By adopting the design mode, on the basis of improving the screen ratio of the display device, higher requirements are provided for the light transmittance at the position where the light sensing device is arranged in the display panel. On the basis, how to make the display panel have a better display effect at the position where the light sensing device is correspondingly disposed is also a research focus of related technicians.

[ summary of the invention ]

In view of this, embodiments of the present invention provide a display panel, a control method thereof, and a display apparatus, so as to improve light transmittance at a position of the display panel where a light sensing device is correspondingly disposed, and improve a display effect at the position.

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

a first optical layer and a second optical layer which are stacked in a thickness direction of the display panel; the first optical layer and the second optical layer can decompose incident natural light into first linearly polarized light and second linearly polarized light which are separated in space, and synthesize the 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 between the first optical layer and the second optical layer; the polarization adjusting layer comprises a magneto-optical crystal layer, a linear polarizer and a half wave plate which are stacked along the thickness direction of the display panel; wherein the content of the first and second substances,

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

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

In 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 set, and the polarization adjustment film set includes:

a first optical layer and a second optical layer which are stacked in a thickness direction of the display panel; the first optical layer and the second optical layer can decompose incident natural light into first linearly polarized light and second linearly polarized light which are separated in space, and synthesize the 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 between the first optical layer and the second optical layer; the polarization adjusting layer comprises a magneto-optical crystal layer, a linear polarizer and a half wave plate which are stacked along the thickness direction of the display panel;

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

the working state of the display panel comprises a first working state and a second working state;

the control method comprises the following steps:

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

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

According to the display panel, the control method and the display device provided by the embodiment of the invention, the optical layer and the second optical layer are arranged, and the polarization adjusting layer comprising the linear polarizer, the magneto-optical crystal layer and the half-wave plate is arranged, so that the polarization directions 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 that the light rays emitted by the light emitting device in the light emitting device layer propagate to the outer side of the display panel and in the process that the external light propagates to the inner side of the display panel, 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. Not only can guarantee display panel light-emitting intensity and picture contrast under first operating condition, moreover, can also satisfy display panel high light transmittance requirement under second operating condition, satisfied user's different user demands.

In addition, when the display panel is in the first working state, based on the arrangement of the embodiment of the invention, not only can the external light be prevented from entering the display panel, but also the intensity of the reflected ambient light emitted from the display panel is reduced. In addition, in the embodiment of the invention, the linear polarizer is arranged to comprise 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 the 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 polarizer comprising the quarter-wave plate and the linear polarizer for reducing the reflectivity in the related art, by adopting the scheme of the embodiment of the invention, the utilization rate of the light emitted by the light emitting device layer can be greatly improved in the display process of the display panel, and the brightness of the display panel can be improved 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 needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

FIG. 2 is a diagram illustrating a film structure in a light-collecting region of a display panel;

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

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

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

fig. 6 is a schematic diagram illustrating the change of the polarization direction of the polarized light with the polarization direction and the first direction D1 at an included angle σ after passing through a 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 invention;

FIG. 9 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 8 in the first operation state;

FIG. 10 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 8 in the second operation state;

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

FIG. 12 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 11 in the first operation state;

FIG. 13 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 11 in the second operation state;

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

FIG. 15 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 14 in the first operation state;

FIG. 16 is a schematic view of light emitted from the external light source to the display panel having the structure shown in FIG. 14 in the second operation state;

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

[ detailed description ] embodiments

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 the examples of the present invention 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 type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The embodiment of the invention provides a display panel. As shown in fig. 1, fig. 1 is a schematic top view of a display panel provided in an embodiment of the present invention, where the display panel includes a display area AA1 and a light collecting area AA2, and the display area AA1 at least partially surrounds the light collecting area AA 2. In the embodiment of the present invention, each of the display area AA1 and the light collecting area AA2 includes a plurality of sub-pixels (not shown). That is, both the display area AA1 and the lighting area AA2 can display a screen. For the sake of distinction, a sub-pixel located in the display area AA1 is named a first sub-pixel, and a sub-pixel located in the light collecting area AA2 is named a second sub-pixel. According to the functions to be performed by the display panel, the embodiment of the invention may provide a corresponding light sensing device corresponding to the lighting area AA2 of the display panel, so that the display panel can perform functions other than displaying. Optionally, the light sense device includes module of making a video recording, fingerprint identification sensor, iris sensor, distance sensor, one or more in the ambient light brightness sensor.

The following describes the structure of the display panel in the lighting area AA 2.

In the embodiment of the present invention, as shown in fig. 2, fig. 2 is a schematic diagram of a film layer 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 away from the base substrate 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 disposed with a plurality of Light Emitting devices of different Light Emitting types, such as an Organic Light Emitting Diode (OLED), a Micro Light Emitting Diode (Micro-LED), a Quantum dot Light Emitting Diode (QLED), and so on, which are not limited in the embodiments of the present invention. Subsequently, a light sensing device (not shown) may be disposed on a side of the substrate 10 away from the driving circuit layer 11.

In the embodiment of the present invention, the lighting area AA2 further includes at least one polarization adjusting film assembly 2. As shown in fig. 2, four polarization adjusting film sets 2 are disposed in the light collecting area AA2, each polarization adjusting film set 2 includes a first optical layer 21 and a second optical layer 22, and the first optical layer 21 and the second optical layer 22 are disposed on the 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 set 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 the magneto-optical crystal layer 23, the linear polarizer 24, and the half-wave plate 25, which are laminated 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 and second linearly polarized lights can be combined into a natural light after passing through the first and second

optical layers

21 and 22. As shown in fig. 3, fig. 3 is a schematic diagram of natural light after passing through the first optical layer, and after passing 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. Solid-line one-way arrows on both sides of the first optical layer 21 in fig. 3 indicate the traveling direction of light, and dotted-line two-way arrows indicate the polarization direction of light, as is the case without specific description, and the arrows in the remaining drawings have the same meaning. 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, and the second linearly polarized light entering from the first region 211 of the first optical layer 21 and the first linearly polarized light entering from the second region 212 of the first optical layer 21 are combined into natural light after passing through the first optical layer 21 and then emitted. 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 birefringent materials.

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

Under the action of a magnetic field, the magneto-optical crystal layer 24 can rotate the polarization direction of linearly polarized light by a preset angle clockwise or counterclockwise. 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 out of 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, calcium iron garnet, calcium chromium garnet, and yttrium iron garnet.

After the linearly polarized light passes through the half-wave plate 25, the polarization direction of the emergent light can also rotate by a corresponding angle according to an included angle between the polarization direction of the incident light and the fast axis of the half-wave plate 25.

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

δ＝β+θ＝β+(β-σ)＝2β-σ (1)

when the display panel is in operation, light emitted from the light emitting device layer 12 passes through the first optical layer 21 and then is converted into first linearly polarized light and second linearly polarized light. Then, the first linearly polarized light and the second linearly polarized light are emitted toward the second optical layer 22 through the polarization adjustment layer including the linear polarizer 24, the magneto-optical crystal layer 24, and the half-wave plate 25. In the process of entering the display panel, the external light passes through the second optical layer 22 and then becomes the first linearly polarized light and the second linearly polarized light. Then, the first linearly polarized light and the second linearly polarized light are emitted to the first optical layer 21 through the above-described polarization adjustment layer. When the lighting area AA2 includes a plurality of operating states, such as a first operating state for displaying and a second operating state for lighting, in different operating 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 of the polarizing adjustment layer by adjusting and controlling the magnitude of the magnetic field of the magneto-optical crystal layer 24. For example, in the first operating 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 linearly polarized light by a first preset angle under the first magnetic field, and the setting of the first preset angle may satisfy the following condition:

1. the light emitted by the light emitting device layer 12 is made into two linearly polarized light beams having polarization directions orthogonal to each other when propagating to the second optical layer 22, so that the two polarized light beams can pass through the second optical layer 22 to be emitted as natural light;

2. the polarization directions of the two polarized lights when the external light propagates to the linear polarizer 23 are different from the directions of the transmission axes of the first region 231 and the second region 232 of the linear polarizer 23, so that the external light is cut at the position of the linear polarizer 23, and the external light is prevented from being emitted to the material with strong reflectivity in the display panel, thereby reducing the intensity of the reflected ambient light emitted from the display panel and improving the contrast of the display picture of the display panel.

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

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

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

For example, the above-mentioned polarization adjusting film assembly 2 may be only located in the light collecting area AA2 of the display panel. Alternatively, in the embodiment of the present invention, the area of the polarization adjustment film group 2 may be set to be larger, so that the polarization adjustment film group 2 covers the display area AA1 of the display panel in addition to the light collecting area AA 2. When the polarization adjusting film group 2 is arranged to cover the display area AA1 and the light collecting area AA2, the magnetic fields of the magneto-optical crystal layer 24 located in the display area AA1 and the magneto-optical crystal layer 24 located in the light collecting area AA2 can be independently controlled to meet 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 of the base substrate 10. The size of the single polarization adjusting film assembly 2 can 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 sub-pixel located in the display area AA1 and the second sub-pixel located in the light collecting area AA2 may be lit, so that both the display area AA1 and the light collecting 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 may display a complete picture together. Alternatively, the lighting area AA2 and the display area AA1 may be displayed independently. For example, the day, time, incoming call reminder, etc. may be displayed using the lighted area AA 2.

When the light sensing device arranged corresponding to the light collecting area AA2 operates, the second sub-pixel located in the light collecting area AA2 may not be lit, so that light in the external environment is emitted to the light sensing device through the light collecting area AA2, and the light sensing device operates.

Optionally, in an embodiment of the present invention, each of the first optical layer 21 and the second optical layer 22 includes a polarizing prism. The polarizing prism is a polarizing device made of a crystal having birefringence characteristics. The natural light is divided into two linearly polarized lights with polarization directions perpendicular to each other after passing through the polarizing prism. Two mutually perpendicular linearly polarized light beams pass through the polarizing prism and become natural light. Illustratively, in embodiments of the present invention, the polarizing prism may be a Glan prism.

As shown in fig. 7, fig. 7 is a schematic view of a polarization prism provided in an embodiment of the present invention, and the polarization prism is a rectangular parallelepiped. 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 the included angle between the first side 2001 and the second side 2002 is a right angle. In the polarizing prism 20: the first side surfaces of the first and second sub-prisms 201 and 202 are parallel to each other; the second side of the first sub-prisms 201 and the second side of the second sub-prisms 202 are parallel to each other; the third side surface of the first sub-prism 201 and the third side surface of the second sub-prism 202 are bonded through an adhesive layer; the first side surface of the second sub-prism 202 and the first side surface of the third sub-prism 203 are bonded through 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 a glue layer. This is so arranged that the width of the polarizing prism 20 having a rectangular parallelepiped shape is equal to the height, and the length thereof is equal to twice the width.

When the polarizing prism 20 having the structure shown in fig. 7 is applied to form a display panel, in conjunction with fig. 2 and 7, the embodiment of the present invention may arrange the second sides of the second and

fourth sub-prisms

202 and 204 in parallel to the plane of the base substrate 10. In the process of emitting light emitted from the light emitting device layer 12 to the outside of the display panel, light enters from the second side surfaces of the second and

fourth sub-prisms

202 and 204 and exits from the second side surfaces of the first and

third sub-prisms

201 and 203. Thus, the third side of each sub-prism forms a 45 ° angle with the plane of the substrate 10. Two linearly polarized lights with mutually perpendicular polarization directions, which are divided after the natural light passes through the polarizing prism 20, can be respectively 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 light emitted from different positions of the display panel is ensured.

For example, when the first optical layer 21 and the linear polarizer 23 are stacked, the embodiment of the invention may make the first linearly polarized light emitted from the first region 211 of the first optical layer 21 correspond to the first region 231 of the linear polarizer 23, and make the second linearly polarized light emitted from the second region 212 of the first optical layer 21 correspond to 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 or a polymer may be used to fabricate the linear polarizer. In an example where the linear polarizer 23 is made of a material including a polymer film, in the first region 231 of the linear polarizer 23, the polymer film includes a plurality of first polymer molecular chains arranged along the third direction D3 and extending along the fourth direction D4, so that the first region 231 of the linear polarizer 23 allows linearly polarized light polarized along the third direction D3 to transmit therethrough, that is, the extending direction of the transmission axis of the first region 231 is parallel to the third direction D3. In the second region 232 of the linear polarizer 23, the polymer film includes a plurality of second polymer molecular chains extending in the third direction D3 and arranged in the fourth direction D4, so that the second region 232 of the linear polarizer 23 allows linearly polarized light polarized in the fourth direction D4 to transmit therethrough, i.e., the transmission axis of the second region 232 extends in a direction parallel to the fourth direction D4.

Illustratively, the polymer film includes Polycarbonate (PC), 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 axis direction to uniformly align molecules in the polymer film, thereby implementing 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 disposed in a stack on the side of the light emitting device layer 12 away from the base substrate 10, the boundary region 230 corresponds to the interface between the second and

third sub-prisms

202 and 203. So as to ensure that the first linearly polarized light emitted from the first optical layer 21 is incident on the first region 231 of the linear polarizer 23 and the second linearly polarized light emitted 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 away from the substrate base 10 in the thickness direction of the display panel. So set up, on the basis that can't pass through linear polarizer 23 in the normal light-emitting and display mode environment light of the luminescent device who guarantees to be located display panel inside, when display panel is in the daylighting mode, can be through adjusting the magnetic field of exerting on magneto-optical crystal layer 24, make magneto-optical crystal layer 24 have certain polarisation angle, the polarization direction of the environment light of guaranteeing to the inside incidence of display panel under the daylighting mode when propagating to linear polarizer 23 is the same with the direction of the transmission axis of linear polarizer 23 and can see through.

Optionally, 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 have a plurality of setting manners in terms of positional relationship. The following are described separately:

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, in which a half-wave plate 25 is located on a side of the magneto-optical crystal layer 24 away from the light emitting device 120 in 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 extending direction of the fast axis of the half-wave plate 25 forms an angle beta with the first direction D1₁(ii) a In a first working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a first preset angle alpha₁，α₁And beta₁Satisfies the following conditions: alpha is alpha₁＝2β₁-90 °; and, beta₁≠45°，β₁Not equal to 90 deg.. In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a second preset angle alpha₂，α₂Satisfies the following conditions: alpha is alpha₂＝90°-2β₁Or, a₂＝270°-2β₁。

Specifically, in the first operating state, as shown in fig. 8, the light emitted from the light emitting device 120 after passing through the first optical layer 21 is divided into linearly polarized light with a polarization direction along the first direction D1 and linearly polarized light with a 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 respectively named as the first pixel light beam and the second pixel light beam hereinafter. The first pixel beam is emitted from the first region 211 of the first optical layer 21, and the second pixel beam is emitted from the 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.

The first and second pixel beams then pass through the magneto-optical crystal layer 24 with the polarization direction rotated clockwise by a first predetermined angle α₁So that the angle between the polarization direction of the first pixel beam exiting through the magneto-optical crystal layer 24 and the first direction D1 becomes α₁The angle between the polarization direction of the second pixel beam exiting through the magneto-optical crystal layer 24 and the first direction D1 becomes 90 ° + α₁. In addition, at α₁When the angle is less than 0 degree, the polarization direction of the emergent light rotates clockwise alpha₁Can be regarded as a clockwise rotation of 360 ° + α₁Or, alternatively, rotate counterclockwise by | α₁|。

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 to the half-wave plate 25 and the first direction is α₁The optical axis 250 of the half wave plate and the firstThe angle β between the directions D1 is β₁，α₁And beta₁Satisfies the following conditions: alpha is alpha₁＝2β₁-90 °. Changing sigma to alpha₁，β＝β₁And alpha₁＝2β₁-90 ° is calculated by substituting equation (1): delta 2 beta₁-(2β₁-90 °) 90 °; that is, after passing through the half wave plate 25, the polarization direction of the outgoing light of the first pixel beam is parallel to the second direction D2.

Similarly, for the second pixel beam, the polarization direction of the second pixel beam incident on the half-wave plate 25 forms an angle σ of (90 ° + α) with the first direction D1₁) Changing σ to 90 ° + α₁，β＝β₁And alpha₁＝2β₁-90 ° calculated by substituting equation (1): delta 2 beta₁-(90°+α₁) 0 °; that is, after passing through the half wave plate 25, the polarization direction of the exit light of the second pixel beam is parallel to the first direction D1.

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

It can be seen that the embodiment of the present invention passes through the order of α₁＝2β₁The angle of-90 ° can ensure that the light emitted by the light emitting device 120 in the first operating state can normally exit the display panel, and ensure the light intensity of the display panel.

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

After the first external light beam passes through the half-wave plate 25, in the embodiment of the present invention, the polarization direction of the first external light beam incident on the half-wave plate 25 forms an angle σ of 90 ° with the first direction D1, where σ is 90 ° and β is β₁Substituting equation (1) can calculate: delta 2 beta₁-90°＝α₁(ii) a 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 α₁。

Then, the first external light beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light rotates clockwise by a first preset angle alpha₁The included angle between the polarization direction of the emergent light and the first direction D1 becomes 2 alpha₁. In the examples of the present invention, α₁＝2β₁-90°；β₁≠45°，β₁Not equal to 90 degrees; thus, α₁Not equal to 0 DEG, and, alpha₁Not equal to 90 deg., and therefore, 2 alpha₁Not equal to 0 DEG, and, 2 alpha₁Not equal to 180 degrees; since the transmission axis of the first region 231 of the linear polarizer 23 extends in 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 light beam passes through the half-wave plate 25, in the embodiment of the present invention, the polarization direction of the second external light beam incident on the half-wave plate 25 is at an angle σ of 0 ° with respect to the first direction D1, where σ is 0 ° and β is β₁Substituting equation (1) can calculate: delta 2 beta₁＝90°+α₁(ii) a That is, after passing through the half-wave plate 25, the angle between the polarization direction of the outgoing light of the second external light beam and the first direction D1 becomes 90 ° + α₁。

Then the second external light beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light rotates clockwise by a first preset angle alpha₁The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 ° +2 α₁. In the examples of the present invention, α₁＝2β₁-90 °; and, beta₁≠45°，β₁Not equal to 90 degrees; thus, α₁Not equal to 0 DEG, and, alpha₁≠90°，90°+2α₁Not equal to 90 DEG, and, 90 DEG +2 alpha₁Not equal to 270 degrees; since the 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, based on the display panel having the structure shown in fig. 8, the embodiment of the present invention passes through α₁＝2β₁-90 ° and let β₁≠45°，β₁Not equal to 90 degrees; the cut-off of the external ambient light in the linear polarizer 23 during the incident process into the display panel in the normal display mode can be ensured, that is, the external ambient light cannot be incident into the display panel through the linear polarizer 23, so that the ambient light is prevented from being reflected by some metal wires or electrodes inside 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 operates in the second operating 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 diagram of a light ray emitted from the external light in the second operating state to the inside of the display panel having the structure shown in fig. 8, and similar to fig. 9, after the external light passes through the second optical layer 22, the linearly polarized light polarized along the second direction D2 exits from the first region 221 of the second optical layer 22, and the linearly polarized light polarized along the first direction D1 exits from the second region 222 of the second optical layer 22. Hereinafter, the light emitted through the first region 221 of the second optical layer 22 is also referred to as a first external light beam, and the light emitted through the second region 222 of the second optical layer 22 is referred to as a second external light 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 to 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 β₁. Let σ be 90 ° and β be β₁Substituting equation (1) can calculate: delta 2 beta₁-90°＝α₁(ii) a I.e. after passing through the half wave plate 25, the first outerThe included angle between the polarization direction of the emergent light of the boundary beam and the first direction D1 becomes alpha₁＝2β₁-90°。

Then, the first external light beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light rotates clockwise by a second preset angle alpha₂The included angle between the polarization direction of the emergent light and the first direction D1 becomes alpha₁+α₂＝2β₁-90°+α₂. In the examples of the present invention, α₂＝90°-2β₁Or, a₂＝270°-2β₁。

At α₂＝90°-2β₁The angle between the polarization direction of the emergent light after passing through the magneto-optical crystal layer 24 and the first direction D1 is 0 °. At α₂＝270°-2β₁The angle between the polarization direction of the emergent light after passing through the magneto-optical crystal layer 24 and the first direction D1 is 180 °. Both of which 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 transmit the first region 231 of the linear polarizer 23.

Similarly, after the second external light beam passes through the half-wave plate 25, in the embodiment of the present invention, the angle σ between the polarization direction of the second external light beam incident on the half-wave plate 25 and the first direction is 0 °, and the angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₁. Let σ equal to 0 ° and β equal to β₁Substituting equation (1) can calculate: delta 2 beta₁(ii) a 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 2 β₁＝90°+α₁。

The second external beam then passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light is rotated clockwise by alpha₂The included angle between the polarization direction of the emergent light and the first direction D1 becomes 2 beta₁+α₂＝90°+α₁+α₂. In the examples of the present invention, α₂＝90°-2β₁Or, a₂＝270°-2β₁. At α₂＝90°-2β₁The 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 α₂＝270°-2β₁The angle between the polarization direction of the emergent light after passing through the magneto-optical crystal layer 24 and the first direction D1 is 270 °. Both of which are parallel to the direction of the transmission axis of the second region 232 of the linear polarizer 23. Therefore, 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 and second external light beams are emitted through the first optical layer 21 to become natural light, which can enter the light sensing device.

It can be seen that, based on the display panel having the structure shown in fig. 8, the embodiment of the present invention passes through α₂＝90°-2β₁Or, a₂＝270°-2β₁The light sensing device can ensure that external light can be smoothly incident to the light sensing device in the incident process of the external light to the display panel in the lighting mode, and the normal lighting of the light sensing device can be ensured. Wherein, in alpha₂＝90°-2β₁When is α₁+α₂When the angle is 0 °, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a first preset angle α in the first operating state₁In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counterclockwise by a first preset angle α₁。

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

Alternatively, as shown in fig. 11, fig. 11 is a schematic cross-sectional view of another display panel provided in the embodiment of the present invention, and a half-wave plate 25 is located on a side of the linear polarizer 23 close to the substrate 10 along a thickness direction of the display panel. In the display panel having the structure shown in fig. 11, the extending direction of the fast axis 250 of the half-wave plate 25 forms an angle β with the first direction D1₂(ii) a In the first working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a third preset angle alpha₃，α₃And beta₂Satisfies the following conditions: alpha is alpha₃＝90°-2β₂(ii) a And, beta₂≠45°，β₂Not equal to 0 degree; the included angle between the third direction D3 and the first direction D1 is gamma₁，γ₁And beta₂Satisfies the following conditions: gamma ray₁＝2β₂(ii) a The angle between the fourth direction D4 and the first direction D1 is gamma₂，γ₂And beta₂Satisfies the following conditions: gamma ray₂＝2β₂-90 °. In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a fourth preset angle alpha₄，α₄Satisfies the following conditions: alpha is alpha₄＝2β₂-90 °. I.e. alpha₃+α₄When the angle is 0 °, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a third preset angle α in the first operating state₃In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counterclockwise by a third preset angle alpha₃。

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

Then, the first pixel 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 first pixel beam incident to 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 β₂Let σ equal to 0 °, β equal to β₂Substituting equation (1) to calculate δ 2 β₂(ii) a That is, the angle between the polarization direction of the first pixel beam exiting from the half-wave plate 25 and the first direction D1 is 2 β₂(ii) a 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 γ₁，γ₁And beta₂Satisfies the following conditions: gamma ray₁＝2β₂(ii) a Accordingly, the first pixel beam can pass through the first region 231 of the linear polarizer 23.

The second pixel beam passes through a half-wave plate 25In the embodiment of the invention, the included angle σ between the polarization direction of the second pixel light beam incident to the half-wave plate 25 and the first direction is 90 °, and the included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₂Let σ be 90 °, β be β₂Substituting equation (1) to calculate δ 2 β₂-90 °; that is, the angle between the polarization direction of the second pixel light beam emitted from the half-wave plate 25 and the first direction D1 is 2 β₂-90 °; 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 γ₂，γ₂And beta₂Satisfies the following conditions: gamma ray₂＝2β₂-90 °. 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 α₃The included angle between the polarization direction of the emergent light and the first direction D1 becomes 2 beta₂+α₃(ii) a In the examples of the present invention, α₃＝90°-2β₂(ii) a Therefore, the polarization direction of the first pixel beam exiting 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 included angle between the polarization direction of the emergent light and the first direction D1 becomes 2 beta₂-90°+α₃In combination with alpha₃＝90°-2β₂(ii) a It is obtained that the polarization direction of the second pixel beam exiting 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 embodiment of the present invention passes through the order of α₃＝90°-2β₂；γ₁＝2β₂，γ₂＝2β₂The angle of-90 ° can ensure that the light emitted from the light emitting device 120 is not affected in the normal display mode, and ensure the light intensity of the display panel.

In the first operating state, as shown in fig. 12, fig. 12 is a schematic view of light rays of the external ambient light incident into the display panel in the first operating state, the ambient light having a propagation direction opposite to that of the light emitted from the light emitting device shown in fig. 11 in the first operating state passes through the second optical layer 22, and then linearly polarized light polarized in the second direction D2 is emitted from the first region 221 of the second optical layer 22, and linearly polarized light polarized in the first direction D1 is emitted from the second region 222 of the second optical layer 22. Hereinafter, the external light emitted through the first region 221 of the second optical layer 22 is referred to as a first external light beam, and the external light emitted through the second region 222 of the second optical layer 22 is referred to as a second external light beam.

After the first external light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a third preset angle alpha₃The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 ° + α₃In the embodiment of the present invention, α₃＝90°-2β₂Thus, the polarization direction of the light exiting through the magneto-optical crystal layer 24 is 180 ° -2 β from the first direction D1₂。

Thereafter, the first external light beam passes through the first region 231 of the cross polarizer 23 because the direction D3 of the transmission axis of the first region 231 forms an angle γ with the first direction D1₁Is 2 beta₂If the light emitted through the magneto-optical crystal layer 24 is to pass through the first region 231 of the linear polarizer 23, 180 ° -2 β is satisfied₂＝γ₁＝2β₂I.e. beta₂45 deg. is equal to. And also because of beta₂≠45°，β₂Not 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 light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a third preset angle alpha₃The included angle between the polarization direction of the emergent light and the first direction D1 becomes alpha₃＝90°-2β₂. Thereafter, the second external light beam passes through the second region 232 of the linear polarizer 23 because the direction D4 of the transmission axis of the second region 232 makes an angle γ with the first direction D1₂Is 2 beta₂90 degrees, if passing throughThe light emitted from the magneto-optical crystal layer 24 is required to satisfy 90-2 beta in order to pass through the second region 232 of the linear polarizer 23₂＝γ₂＝2β₂-90 °, i.e. β₂45 deg. is equal to. And also because of beta₂≠45°，β₂Not equal to 0 degree; therefore, 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 passes through the order of α₃＝90°-2β₂，γ₁＝2β₂，γ₂＝2β₂-90 ° and let β₂≠45°，β₂Not equal to 0 °, the external ambient light is ensured to be cut off from the linear polarizer 23 in the incident process to the display panel in the normal display mode, that is, the external ambient light cannot be incident to the inside of the display panel through the linear polarizer 23, so that the ambient light is prevented from being reflected by some metal wires or electrode reflection arcs inside 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 operates in the second operating 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 diagram of a light ray emitted from the external light in the second operating state to the inside of the display panel having the structure shown in fig. 11, and similar to the case shown in fig. 12, 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. Hereinafter, the light emitted through the first region 221 of the second optical layer 22 is also referred to as a first external light beam, and the light emitted through the second region 222 of the second optical layer 22 is referred to as a second external light beam.

After the first external light beam passes through the magneto-optical crystal layer 24, the magneto-optical crystal layer 24 enables the polarization direction of the linearly polarized light to rotate clockwise by a fourth preset angle alpha₄The angle between the polarization direction of the outgoing light and the first direction D1 becomes 90 DEG + alpha₄. Then, the first external light beam passes through the first region 231 of the linear polarizer 23, and the transmission axis of the first region 231 forms an angle γ with the first direction D1₁Is 2 beta₂In the present inventionIn the examples, a₄＝2β₂-90 °, or, α₄＝2β₂+90 °; that is, the angle between the polarization direction of the second external light beam 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 can 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 α₄The included angle between the polarization direction of the emergent light and the first direction D1 becomes alpha₄. Then, the second external light beam passes through the second region 232 of the linear polarizer 23, and the transmission axis of the second region 232 forms an angle γ 1 with the first direction D1₂Is 2 beta₂-90 °, in an embodiment of the invention, α₄＝2β₂-90 °, or, α₄＝2β₂+90 °; that is, the angle between the polarization direction of the second external light beam 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 a half wave plate 25. In the embodiment of the present invention, the included angle σ between the polarization direction of the first external light beam incident to the half-wave plate 25 and the first direction is 90 ° + α₄The included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₂Changing σ to 90 ° + α₄，β＝β₂Substituting equation (1) to calculate δ 2 β₂-90°-α₄And in turn because of alpha₄＝2β₂-90 ° or α₄＝2β₂+90 °, so δ is 2 β₂-90°-α₄0 ° or δ 2 β₂-90°-α₄The polarization direction of the first external light beam after passing through the half-wave plate 25 is-180 °, which is parallel to the first direction.

Likewise, the second external beam passes through a half-wave plate 25. In the embodiment of the present invention, the angle σ between the polarization direction of the second external light beam incident to the half-wave plate 25 and the first direction is α₄Half waveThe angle β between the optical axis 250 of the sheet and the first direction D1 is β₂Changing σ to α₄，β＝β₂Substituting equation (1) to calculate δ 2 β₂-α₄And in turn because of alpha₄＝2β₂-90 ° or α₄＝2β₂+90 °, so δ is 2 β₂-90°-α₄90 ° or δ 2 β₂-90°-α₄The polarization direction of the first external light beam after passing through the half-wave plate 25 is parallel to the second direction.

It can be seen that, based on the display panel having the structure shown in fig. 11, the embodiment of the present invention passes through α₄＝2β₂-90 °, or, α₄＝2β₂+90 °; the light sensing device can ensure that external light can be smoothly incident to the light sensing device in the incident process of the external light to the display panel in the lighting mode, and the normal lighting of the light sensing device can be ensured. Wherein, in alpha₄＝2β₂At-90 deg., α₃+α₄When the angle is 0 °, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a third preset angle α in the first operating state₃In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counterclockwise by a third preset angle alpha₃。

Alternatively, as shown in fig. 14, fig. 14 is a schematic cross-sectional view of another display panel provided in the embodiment of the present invention, in which a half-wave plate 25 is located on a side of the magneto-optical crystal layer 24 close to the light emitting device 120 in 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 extending direction of the fast axis 250 of the half-wave plate 25 forms an angle β with the first direction D1₃(ii) a In the first working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a fifth preset angle alpha₅，α₅And beta₃Satisfy the requirement of：α₅＝90°-2β₃(ii) a And, beta₃≠45°，β₃Not equal to 90 degrees; in the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light by a sixth preset angle alpha₆，α₆Satisfies the following conditions: alpha is alpha₆＝2β₃-90 °; or, a₆＝2β₃+90°。

Specifically, in the first operating state, similar to fig. 8, after light emitted from the light emitting device 120 passes through the first optical layer 21, first polarized light is emitted from the first region 211 of the first optical layer 21, and 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 of the polarization direction of the light, the linearly polarized light polarized in the first direction D1 and the linearly polarized light polarized in the second direction D2 are still named in the following by the first pixel light beam and the second pixel light beam, respectively. The first pixel beam is emitted from the first region 211 of the first optical layer 21, and the second pixel beam is emitted from the second region 212 of the first optical layer 21.

Then, the first pixel 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 first pixel beam incident to 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 β₃Let σ equal to 0 °, β equal to β₃Substituting equation (1) to calculate δ 2 β₃(ii) a That is, the included angle between the polarization direction of the first pixel beam after being emitted through the half-wave plate 25 and the first direction D1 is 2 β₃。

Then, the first pixel beam passes through the magneto-optical crystal layer 24, and the polarization direction of the emergent light rotates clockwise by a fifth preset angle alpha₅So that the polarization direction of the first pixel beam exiting through the magneto-optical crystal layer 24 is in the first direction D1Becomes 2 beta₃+α₅In the embodiment of the present invention, α₅＝90°-2β₃(ii) a Therefore, the first pixel beam exiting through the magneto-optical crystal layer 24 has a polarization direction that makes an angle of 90 ° with the first direction D1. In FIG. 14, in β₃＞45°，α₅< 0 deg. 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 β₃Let σ be 90 °, β be β₃Substituting equation (1) to calculate δ 2 β₃-90 °; that is, the angle between the polarization direction of the light emitted from the half-wave plate 25 and the first direction D1 is 2 β₃-90°。

Then the second pixel beam passes through the magneto-optical crystal layer 24, and the polarization direction rotates clockwise by a fifth preset angle alpha₅So that the angle between the polarization direction of the second pixel beam exiting through the magneto-optical crystal layer 24 and the first direction D1 becomes 2 β₃-90°+α₅In the embodiment of the present invention, α₅＝90°-2β₃(ii) a Therefore, the polarization direction of the outgoing light is parallel to the first direction D1.

It can be seen that the embodiment of the present invention passes through the order of α₅＝90°-2β₃The light emitting of the light emitting device 120 in the normal display mode is not affected, and the light emitting intensity of the display panel is ensured.

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

After the first external light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a fifth preset angle alpha₅And the angle with the first direction D1 becomes 90 DEG + alpha₅. After the second external light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a fifth preset angle alpha₅The angle to the first direction D1 becomes alpha₅。

Then, the first external light 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 light beam incident to the half-wave plate 25 and the first direction is 90 ° + α₅The included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₃Changing σ to 90 ° + α₅，β＝β₃Substituting equation (1) to calculate δ 2 β₃-α₅-90 °. In the examples of the present invention, α₅＝90°-2β₃Therefore, the angle between the polarization direction of the light exiting through the half-wave plate 25 and the first direction D1 is 4 β₃-180 °, in an embodiment of the invention β₃≠45°，β₃Not equal to 90 °, therefore, an angle between the polarization direction of the light emitted through the half-wave plate 25 and the first direction D1 is not equal to 0 ° or 180 °, that is, the emitted light is not emitted in the direction different from the direction of the transmission axis of the first region 231 of the linear polarizer 23.

Similarly, when the second external light beam passes through the half-wave plate 25, in the embodiment of the present invention, the angle σ between the polarization direction of the second external light beam incident on the half-wave plate 25 and the first direction is α₅The included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₃Changing σ to α₅，β＝β₃Substituting equation (1) to calculate δ 2 β₃-α₅. In the examples of the present invention, α₅＝90°-2β₃Therefore, the angle between the polarization direction of the light exiting through the half-wave plate and the first direction D1 is 4 β₃-90 °, in an embodiment of the invention β₃≠45°，β₃Not equal to 90 °, therefore, an angle between the polarization direction of the light exiting through the half-wave plate and the first direction D1 is not equal to 90 ° or 270 °, that is, the exiting light cannot exit because the direction of the transmission axis of the second region 232 of the linear polarizer 23 is different from that of the exiting light.

It can be seen that, based on the display panel having the structure shown in fig. 14, the embodiment of the present invention passes through α₅＝90°-2β₃And let beta₃≠45°，β₃Not equal to 90 °, it can be ensured that the external ambient light is 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 traces or electrodes inside 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 operates in the second operating 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 diagram of a light ray emitted from the external light in the second operating state to the inside of the display panel having the structure shown in fig. 14, and similar to fig. 15, after the external light passes through the second optical layer 22, the linearly polarized light polarized along the second direction D2 exits from the first region 221 of the second optical layer 22, and the linearly polarized light polarized along the first direction D1 exits from the second region 222 of the second optical layer 22. Hereinafter, the light emitted through the first region 221 of the second optical layer 22 is also referred to as a first external light beam, and the light emitted through the second region 222 of the second optical layer 22 is referred to as a second external light beam.

After the first external light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a sixth preset angle alpha₆Polarization direction of the emergent lightAt an angle of 90 + alpha to the first direction D1₆. After the second external light beam passes through the magneto-optical crystal layer 24, the polarization direction of emergent light rotates clockwise by a sixth preset angle alpha₆The included angle between the polarization direction of the emergent light and the first direction D1 is alpha₆。

Then, the first external light 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 light beam incident to the half-wave plate 25 and the first direction is 90 ° + α₆The included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₃Changing σ to 90 ° + α₆，β＝β₃Substituting equation (1) to calculate δ 2 β₃-α₆-90 ° in an embodiment of the invention, α₆＝2β₃-90 °, or, α₆＝2β₃+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 the first region 231 of the linear polarizer 23.

Similarly, the second external light beam passes through the half-wave plate 25, and in the embodiment of the present invention, the angle σ between the polarization direction of the second pixel light beam incident on the half-wave plate 25 and the first direction is α₆The included angle β between the optical axis 250 of the half-wave plate and the first direction D1 is β₃Changing σ to α₆，β＝β₃Substituting equation (1) to calculate δ 2 β₃-α₆. In the examples of the present invention, α₆＝2β₃-90 °, or, α₆＝2β₃+90 °, i.e., an angle between the polarization direction of the second external light beam 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 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 be changed into natural light, and the natural light can enter the light sensing device, so that the normal lighting of the light sensing device is ensured.

It can be seen that the embodiment of the present invention is achieved by the display panel having the structure shown in fig. 14Let alpha₆＝2β₃-90 °, or, α₆＝2β₃+90 °, can guarantee that external light can incide to the light sense device smoothly in the incident in-process to the display panel under the daylighting mode, can guarantee the normal daylighting of light sense device. Wherein, in alpha₆＝2β₃At-90 deg., α₅+α₆When the angle is 0 °, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light clockwise by a fifth preset angle α in the first operating state₅In the second working state, the magneto-optical crystal layer 24 rotates the polarization direction of the linearly polarized light counterclockwise by a fifth preset angle α₅。

As shown in fig. 17, fig. 17 is a schematic view of a display device according to an embodiment of the present invention, where the display device includes the display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 17 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.

Illustratively, the display device provided by the embodiment of the present invention further includes a light sensing device 3, as shown in fig. 17, a front projection of the light sensing device 3 on a plane where the display panel 100 is located in the light collecting area AA 2.

Optionally, the light sense device is including the ambient light sensor that is used for the sensing ambient light intensity for sensing user and display panel's distance sensor, and be used for the module of making a video recording of shooing, fingerprint identification module, iris sensor etc. for identification.

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

Referring to fig. 8 and 10, fig. 11 and 13, 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 working 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 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-emitting intensity of the display panel; and the external ambient light can not be incident into the display panel through the linear polarizer, 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.

In a second working 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; the light sensing device can be ensured to be smoothly incident to the light sensing device in the incident process of the external light to the display panel, and the normal lighting of the light sensing device can be ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A display panel, comprising at least one polarization adjusting film set, the polarization adjusting film set comprising:

2. The display panel according to claim 1,

the first optical layer and the second optical layer both comprise polarizing prisms, and the polarizing prisms are cuboids;

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 surfaces of the triangular prisms are isosceles right triangles; 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 surfaces of the first sub-prisms and the second side surfaces of the second sub-prisms are parallel to each other;

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

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

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

the second side surface of the third sub-prism and the second side surface 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. (ii) a

3. The display panel according to claim 2,

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

4. The display panel according to claim 3,

the linear polarizer includes a polymer film;

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

the linear polarizer comprises a boundary area, and the first area and the second area are positioned on two sides of the boundary area;

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

5. The display panel according to claim 1,

the display panel comprises a substrate, and the magneto-optical crystal layer is located on one side, far away from the substrate, of the linear polarizer along the thickness direction of the display panel.

6. The display panel according to claim 5,

and the half wave plate is positioned on one side of the magneto-optical crystal layer far away from the substrate along the thickness direction of the display panel.

7. The display panel according to claim 6,

the first direction is parallel to the third direction, and the second direction is parallel to the fourth direction;

the included angle between the extension direction of the fast axis of the half wave plate and the first direction is beta₁；

In a first working state, the magneto-optical crystal layer enables the polarization direction of linearly polarized light to rotate by a first preset angle alpha₁，α₁And beta₁Satisfies the following conditions: alpha is alpha₁＝2β₁-90 °; and, beta₁≠45°，β₁≠90°；

In a second working state, the magneto-optical crystal layer enables the polarization direction of the linearly polarized light to rotate by a second preset angle alpha₂，α₂Satisfies the following conditions: alpha is alpha₂＝90°-2β₁Or, a₂＝270°-2β₁。

8. The display panel according to claim 5,

and the half wave plate is positioned on one side of the linear polarizer, which is close to the substrate, along the thickness direction of the display panel.

9. The display panel according to claim 8, wherein the extending direction of the fast axis of the half-wave plate is at an angle β with respect to the first direction₂；

In the first working state, the magneto-optical crystal layer enables the polarization direction of linearly polarized light to rotate by a third preset angle alpha₃，α₃And beta₂Satisfies the following conditions: alpha is alpha₃＝90°-2β₂(ii) a And, beta₂≠45°，β₂≠0°；

In the second working state, the magneto-optical crystal layer enables the polarization direction of linearly polarized light to rotate by a fourth preset angle alpha₄，α₄Satisfies the following conditions: alpha is alpha₄＝2β₂-90 °; or, a₄＝2β₂+90°；

The included angle between the third direction and the first direction is gamma₁，γ₁And beta₂Satisfies the following conditions: gamma ray₁＝2β₂；

The included angle between the fourth direction and the first direction is gamma₂，γ₂And beta₂Satisfies the following conditions: gamma ray₂＝2β₂-90°。

10. The display panel according to claim 5,

and the half wave plate is positioned on one side of the magneto-optical crystal layer close to the substrate along the thickness direction of the display panel.

11. The display panel according to claim 10,

the included angle between the extension direction of the fast axis of the half wave plate and the first direction is beta₃；

In the first working state, the magneto-optical crystal layer enables the polarization direction of linearly polarized light to rotate by a fifth preset angle alpha₅，α₅And beta₃Satisfies the following conditions: alpha is alpha₅＝90°-2β₃(ii) a And, beta₃≠45°，β₃≠90°；

In the second working state, the magneto-optical crystal layer enables the polarization direction of linearly polarized light to rotate by a sixth preset angle alpha₆，α₆Satisfies the following conditions: alpha is alpha₆＝2β₃-90 °, or, α₆＝2β₃+90°。

12. The display panel according to claim 1,

the display panel comprises a substrate base plate, the number of the polarized light adjusting modules is multiple, and the polarized light adjusting modules are arranged in an array in a plane parallel to the plane of the substrate base plate.

13. The display panel according to claim 1,

the material of the magneto-optic crystal layer comprises any one of magnesium aluminum garnet, iron aluminum garnet, manganese aluminum garnet, calcium iron garnet, calcium chromium garnet and yttrium iron garnet.

14. A display device characterized in that it comprises a display panel according to any one of claims 1 to 13.

15. The control method of the display panel is characterized in that the display panel comprises at least one polarization adjusting film group, and the polarization adjusting film group comprises:

the control method comprises the following steps:

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

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