WO2022193834A1

WO2022193834A1 - Backlight source structure

Info

Publication number: WO2022193834A1
Application number: PCT/CN2022/073004
Authority: WO
Inventors: 马骏; 薛九枝
Original assignee: 江苏集萃智能液晶科技有限公司
Priority date: 2021-03-17
Filing date: 2022-01-20
Publication date: 2022-09-22
Also published as: CN112882148A

Abstract

A backlight source structure, comprising: a lighting assembly (1), a light guide plate (3), a dimming film (4), and a light reflecting sheet (2) located on one side of a light reflecting surface of the light guide plate (3). The light guide plate (3) has a light incident surface, a light exit surface, and the light reflecting surface; a contact angle between a tangent line of any point on the surface of a first surface microstructure (31) on the light reflecting surface and the light reflecting surface is not larger than 9°; an included angle between a tangent line of any point on the surface of a second surface microstructure (32) on the light incident surface and the light incident surface is 30-70°; an included angle between a tangent line of any point on the surface of a third surface microstructure (33) on the light exit surface and the light incident surface is not larger than 70°. The dimming film (4) located on one side of the light exit surface of the light guide plate (3) comprises a substrate layer (41) and a microstructure layer (42), and the microstructure layer (42) has triangular prism strips extending along the direction parallel to the light incident surface and arranged intermittently or continuously. Thus, large angle light and a light exit angle are reduced, and the utilization rate and brightness of a backlight source are improved.

Description

A backlight structure

This application claims the priority of the invention patent application whose filing date is March 17, 2021, the application number is CN202110286344.3, and the invention name is "a backlight structure", the entire contents of which are incorporated into this application by reference.

technical field

The present invention relates to the technical field of liquid crystal display backlight sources, in particular to a backlight source structure.

Background technique

Backlight is an important component used in display and lighting fields, and it plays the role of forming a uniform surface light source. The traditional backlight structure usually adds dots or grooves on the surface of the light guide plate to destroy the waveguide propagation of light, diffuses the light emitted from the light guide plate through the diffusion film, and then contracts the light through the brightness enhancement film. The final outgoing light angle of the traditional backlight source is usually within ±35° perpendicular to the light outgoing surface. The traditional backlight source has a large light angle due to the diffusion effect of the diffuser, and the brightness is limited in the front view direction.

In addition, in some special industries, such as: shopping or account transactions on the Internet, during the above operations, operators often need to enter personal information on display devices such as computers, mobile phones, ATMs, and automatic ticket machines. Therefore, it is easy to cause the leakage of personal information, and special display devices are required to ensure the safety of the operator's personal information. In particular, confidential information needs to be transmitted to specific personnel, which requires the display device that transmits information to have anti-peeping performance. , the backlight needs to have a small light output range. Therefore, based on the requirements of improving the brightness of the backlight source and reducing the light exit angle, an achievable backlight source structure design solution is required.

SUMMARY OF THE INVENTION

The present application mainly solves the problems of large light angle in the design of the backlight structure and limited brightness in the front view direction, and provides a backlight structure.

In order to achieve the above purpose, the present application provides a backlight structure, which includes: a lighting assembly; The light-emitting surfaces are vertical and adjacent, the light-incident surface is located on the side close to the lighting assembly, the light-reflecting surface and the light-exiting surface are positioned opposite to each other, and the light-reflecting surface is provided with a first surface microstructure, The contact angle between the tangent of any point on the surface of the first surface microstructure and the reflective surface is not greater than 9°, the light incident surface is set to have a second surface microstructure, and the surface of the second surface microstructure has any contact angle. The angle between the tangent of a point and the light incident surface is 30° to 70°, the light exit surface is set to have a third surface microstructure, and the tangent of any point on the surface of the third surface microstructure is related to the incident light. The included angle of the surface is not more than 70°, and the light exit angle of the light guide plate is between 65° and 90°; the light adjustment film is located on the side of the light exit surface of the light guide plate, and the light adjustment film is located on the light exit surface side of the light guide plate. The dimming film includes a base material layer and a microstructure layer, the microstructure layer is a triangular prism strip extending in a direction parallel to the light incident surface and arranged intermittently or continuously; a reflective sheet, the reflective sheet is located in the one side of the reflective surface of the light guide plate.

As a further improvement of the present application, the first surface microstructure is a plurality of convex or concave dot microstructures.

As a further improvement of the present application, the dot microstructure is a pyramid structure, a pyramid structure or a cambered structure.

As a further improvement of the present application, the arc structure is one of a partial sphere, an ellipsoid or an elliptical paraboloid, and the projection of the arc structure on the reflective surface is a circle or an ellipse.

As a further improvement of the present application, the second surface microstructure and/or the third surface microstructure is an outwardly convex or inwardly concave strip-like structure.

As a further improvement of the present application, the angle between the tangent of any point on the surface of the strip structure and the light incident surface or the light exit surface is 30°˜70°.

As a further improvement of the present application, the strip structure is one or more of prism strips, cylindrical strips or trapezoidal strips.

As a further improvement of the present application, the spacing between adjacent strip structures is 30 μm˜140 μm.

As a further improvement of the present application, the triangular prism strip is located on the side away from the light-emitting surface of the light guide plate, and the bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86°-90°, away from the The bottom angle B of the triangular prism strip on the light incident surface side is 66°˜74°, and the bottom width L of the triangular prism strip is 6 μm˜25 μm.

As a further improvement of the present application, the triangular prism strip is located on the side close to the light exit surface of the light guide plate, and the bottom angle C of the triangular prism strip on the side close to the light incident surface is 30°-80°, far from the The bottom angle D of the triangular prism strip on the light incident surface side is 30°˜80°, and the bottom width P of the triangular prism strip is 5 μm˜35 μm.

As a further improvement of the present application, the microstructure layer is prepared from a resin material with a refractive index between 1.45 and 1.7.

As a further improvement of the present application, it also includes an improved layer of doped scattering particles fixed to the side of the light-adjusting film facing away from the light guide plate.

As a further improvement of the present application, the scattering particles are distributed in the hot spot area M of the improvement layer close to the light incident surface.

As a further improvement of the present application, the scattering particles are distributed throughout the improvement layer, and the scattering particles are in the improvement layer from a side close to the light incident surface to a side away from the light incident surface The distribution density gradually decreases.

As a further improvement of the present application, a dimming element is further provided on the side of the dimming film facing away from the light guide plate.

As a further improvement of the present application, the dimming element includes a base material and a dopant material, and the dopant material rotates in the base material when electrified.

As a further improvement of the present application, the refractive index difference between the refractive index n1 of the base material and the refractive index n2 of the doping material is between 0.3 and 3.

As a further improvement of the present application, the doping material is composed of rod-shaped molecules.

As a further improvement of the present application, the width of the rod-shaped molecule is between 50nm and 1000nm, and the length of the rod-shaped molecule is between 500nm and 50um.

The beneficial effect of the present application is that, compared with the traditional backlight structure, the backlight structure designed in the present application not only reduces the large-angle light and improves the utilization rate of the backlight, but also reduces the light exit angle, which improves the efficiency of the backlight. Brightness; in addition, the backlight structure designed in the present application also avoids the problem of hot spots or uneven light and dark optical defects caused by the lighting components on the light incident surface.

Description of drawings

FIG. 1 is a schematic three-dimensional structural diagram of a backlight structure according to an embodiment;

2 is a front view of a backlight structure of an embodiment;

Fig. 3 is the front view of the light guide plate structure;

4 is a top view of the light guide plate structure;

Fig. 5 is the left side view of the light guide plate structure;

Figure 6 is a diagram of the type of stripes in the second surface microstructure and/or the third surface microstructure;

FIG. 7 is a schematic view of the angle of strip-like structures in the second surface microstructure and/or the third surface microstructure;

FIG. 8 is a front view of the structure of the dimming film according to an embodiment;

FIG. 9 is a schematic diagram of light correction of a dimming film structure according to an embodiment;

FIG. 10 is a front view of another embodiment of the dimming film structure;

11 is a schematic diagram of light correction of the structure of the dimming film according to another embodiment;

12 is a schematic structural diagram of a composite light-adjusting film;

13 is an embodiment of the improved layer doping particle distribution in the composite dimming film;

FIG. 14 is another embodiment of the improved layer doping particle distribution in the composite dimming film;

15 is a front view of a backlight structure of another embodiment;

FIG. 16 is a schematic structural diagram of a dimming element;

17 is a top view of the molecular state of the dopant material in the wide viewing angle dimming element;

18 is a top view of the molecular state of the dopant material in the narrow viewing angle dimming element;

In the figure: 1. Lighting assembly; 2. Reflective sheet; 3. Light guide plate; 4. Light adjustment film; 5. Light adjustment element; 31, First surface microstructure; Surface microstructure; 41, base material layer; 42, microstructure layer; 43, improvement layer; 51, basic material; 52, doping material.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the specific embodiments of the present application and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments, and are not intended to limit the scope of the present invention. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work, all belong to the scope of protection of the present application.

Aiming at the problems in the prior art that the backlight structure is designed with a large light angle and the brightness in the front view direction is limited, the embodiment of the present application provides a backlight structure, which includes an illumination assembly 1, a light guide plate 3, a light adjustment The film 4 and the reflection sheet 2 located on the side of the light-reflecting surface of the light guide plate 3 . Wherein: the lighting assembly 1 is further preferably an LED light source; the light guide plate 3 has a light incident surface, a light exit surface and a light reflection surface, the light entrance surface is perpendicular to and adjacent to the light exit surface, and the light entrance surface is located at the Close to one side of the lighting assembly 1 , the reflective surface and the light-emitting surface are located opposite to each other, and the reflective surface is provided with a first surface microstructure 31 , any point on the surface of the first surface microstructure 31 The contact angle between the tangent of the reflective surface and the reflective surface is not greater than 9°, the light incident surface is set to have a second surface microstructure 32, and the tangent of any point on the surface of the second surface microstructure 32 is related to the light incident surface. The included angle is 30°-70°, the light-emitting surface is set to have a third surface microstructure 33, and the angle between the tangent at any point on the surface of the third surface microstructure 33 and the light-incident surface is not greater than 70° °, the structural design of the light guide plate above makes the light exit angle of the light guide plate 3 between 65° and 90°; the light adjustment film 4 is located on the side of the light exit surface of the

light guide plate

3, 4 includes a base material layer 41 and a microstructure layer 42, the microstructure layer 42 has triangular prism strips extending in a direction parallel to the light incident surface and arranged intermittently.

In this application, as a preferred embodiment, the cross-sectional structure of the triangular prism strip is an isosceles triangle or a non-isosceles triangle, and the function of the light-adjusting film 4 is mainly to correct the light emitted from the light guide plate 3. The microstructure layer 42 is made of a resin material with a refractive index between 1.45 and 1.7. The backlight structure prepared from the light guide plate 3 and the dimming film 4 designed by the above structure can correct the angle of the light coming out of the backlight structure to be within the range of ±15° perpendicular to the light emitting surface, and at the same time reduce the large-angle light, so that the More light is gathered in a small light output range, improving the brightness of the backlight.

In this application, as a preferred embodiment, the first surface microstructure 31 is a plurality of convex or concave dot microstructures. As a further preferred embodiment, the dot microstructure is a pyramid structure, a pyramid structure or a cambered structure. As a further preferred embodiment, the arc structure is one of a partial sphere, an ellipsoid or an elliptical paraboloid, and the projection of the arc structure on the reflective surface is a circle or an ellipse.

In the present application, as a preferred embodiment, the second surface microstructures 32 and/or the third surface microstructures 33 are strip-like structures that are convex or concave. As a further preferred embodiment, the angle between the tangent line at any point on the surface of the strip structure and the light incident surface or the light exit surface is 30°˜70°. As a further preferred embodiment, the strip structure is one or more of prism strips, cylindrical strips or trapezoidal strips. Preferably, the spacing between adjacent strip structures is 30 μm˜140 μm.

In this application, as a preferred embodiment, the triangular prism strip is located on the side away from the light-emitting surface of the light guide plate 3, and the bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86°-90° , the bottom angle B of the triangular prism strip on the side away from the light incident surface is 66°～74°, and the bottom width L of the triangular prism strip is 6 μm～25 μm; the triangular prism strip is located close to the light guide plate 3 On the side of the light-emitting surface, the base angle C of the triangular prism strip on the side close to the light-incident surface is 30°～80°, and the base angle D of the triangular prism strip on the side away from the light-incident surface is 30°～80° °, the bottom width P of the triangular prism strip is 5 μm˜35 μm.

In the present application, as a preferred embodiment, it also includes an improvement layer 43 doped with scattering particles fixed to the side of the light-adjusting film 4 away from the light guide plate 3 . As a further preferred embodiment, the scattering particles are distributed in the hot spot area M of the improvement layer 43 close to the light incident surface; the scattering particles are distributed throughout the improvement layer 43, and The distribution density of the scattering particles in the improvement layer 43 decreases gradually from the side of the light incident surface to the side away from the light incident surface.

In this application, as a preferred embodiment, a light-adjusting element 5 is further provided on the side of the light-adjusting film 4 away from the light guide plate 3 . The main purpose of the dimming element 5 is to perform secondary processing on the light exiting through the dimming film 4±15°, so as to increase the brightness and adjust the viewing angle range at the same time. The dimming element 5 includes a base material 51 and a dopant material 52, and the dopant material 52 rotates in the base material 51 when electrified. As a further preferred embodiment, the refractive index difference between the refractive index n1 of the base material and the refractive index n2 of the doping material 52 is between 0.3 and 3. Preferably, the doping material 52 is composed of rod-shaped molecules, and the length of the rod-shaped molecules is at least 10 times longer than the width. Further preferably, the width of the rod-shaped molecule is between 50nm and 1000nm, and the length of the rod-shaped molecule is between 500nm and 50um.

The structure of the backlight source according to the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Example 1

This embodiment provides a backlight structure. As shown in Figures 1 and 2, the backlight structure consists of an LED light source assembly, a bottom reflective sheet 2, a light guide plate 3 and a light adjustment film 4; the bottom reflective sheet 2 will be directed to the bottom The light reflected back into the light guide plate 3 improves the utilization rate of light; the light guide plate 3 can form a uniform surface light source for the light propagated by the waveguide;

In the present embodiment, the structure of the light guide plate 3 is shown in FIG. 3 , the light guide plate 3 has a light-reflecting surface, a light-incident surface, and a light-exiting surface; the first surface microstructure is formed on the light-reflecting surface through processes such as collision points and precision machining. 31; The first surface microstructure 31 can be but not limited to concave or convex pyramids, arcs and other structures; its main feature is that the tangent of each point on the first surface microstructure 31 is the same as the horizontal direction The angle is less than 9°.

In this embodiment, a second surface microstructure 32 is provided on the light incident surface of the light guide plate 3 on the side close to the LED light source. The arrangement of the second surface microstructure 32 is shown in FIGS. 4 and 5 . The second surface microstructure 32 is a convex or concave strip structure, which can be, but not limited to, prism strips, cylindrical strips, trapezoidal strips and other structures, as shown in FIG. 6 . In this embodiment, the extending direction of the strip-like structures of the second surface microstructures 32 is the Y-direction arrangement in FIG. 5 , and the arrangement direction of the strip-like structures of the second surface microstructures 32 is the Z-direction in FIG. 4 ; The spacing between adjacent strip structures in the surface microstructures 32 is 30um-140um, and adjacent strip structures can also be arranged next to each other; the tangent of any point on any strip structure on the second surface microstructure 32 The angle β with the horizontal plane is 30° to 70°, and the schematic diagram of the angle identification is shown in FIG. 7 .

In this embodiment, a third surface microstructure 33 is further provided on the light exit surface of the light guide plate 3 , and the arrangement of the third surface microstructure 33 is shown in FIGS. 4 and 5 , and the third surface microstructure 33 may be The strip-like structure is convex or concave, the strip-like structure can be but not limited to prism strips, cylindrical strips, etc., as shown in FIG. 6 . In this embodiment, the extending direction of the strip-like structures of the third surface microstructures 33 is the X-direction arrangement in FIG. 4 , and the arrangement direction of the strip-like structures of the third surface microstructures 33 is the Z-direction in FIG. 5 ; The spacing between adjacent strip-shaped structures in the microstructure 33 is 30um to 140um, and adjacent strip-shaped structures can also be arranged next to each other; the tangent of any point on any strip-shaped structure on the third surface microstructure 33 and The angle of the horizontal plane is not greater than 70°. In this embodiment, the angle between the tangent of any point on any strip-like structure on the third surface microstructure 33 and the horizontal plane is 30°˜70°. The continuous change of the structure surface may also be a single fixed angle, or the case of intermittent change or irregular change, which is not repeated here, and the angle identification is schematically shown in FIG.

In this embodiment, by arranging the first surface microstructure 31 , the second surface microstructure 32 and the third surface microstructure 33 on the light guide plate 3 , the light emitted from the LEDs passes through the light guide plate 3 to form 65°˜90° ° narrow angle light output range.

In this embodiment, a light adjustment film 4 is also provided above the light guide plate 3 , and the function of the light adjustment film 4 is mainly to correct the light emitted by the light guide plate 3 . The dimming film 4 includes a base material layer 41 and a microstructure layer 42. As shown in FIG. 8 and FIG. 10 , the microstructure layer 42 is arranged in triangular prism strips, and the extension direction of the triangle is the Z direction. The arrangement direction is the X direction, and the microstructure layer 42 is prepared from a resin material with a refractive index between 1.45 and 1.7. FIG. 8 is a schematic structural diagram of an embodiment of the dimming film 4 . The microstructure layer 42 is arranged in non-isosceles triangle prism strips. The cross-sectional structure of the microstructure layer 42 is shown in FIG. 9 . The base angle A of the prism strip on the light incident side is 86°～90°, the base angle B of the prism strip on the side away from the light incident surface is 66°～74°, and the bottom width L of the non-isosceles triangle is 6um～25um. FIG. 10 is a schematic structural diagram of another embodiment of the light-adjusting film 4 . The microstructure layer 42 is arranged in isosceles triangle or non-isosceles triangle prism strips. The cross-sectional structure of the microstructure layer 42 is shown in FIG. 11 . The bottom angle C of the prism strip on the light incident side near the light guide plate 3 is 30°-80°, the bottom angle D of the prism strip on the side away from the light incident surface is 30°～80°, and the bottom width P of the prism strip structure is 5um～35um . The dimming film 4 composed of the base material layer 41 and the microstructure layer 42 can reduce the large-angle light, correct the light exit angle of the light guide plate 3 to within the range of ±15° perpendicular to the light exit surface, and improve the frontal brightness of the backlight source. The principle structure of light correction is shown in Figure 9 and Figure 11.

In this embodiment, an improvement layer 43 is also provided above the light-adjusting film 4 , as shown in FIG. 12 . In the improvement layer 43, the light emitted from the hot spot region M is homogenized by doping the scattering particles. The distribution of doping examples is shown in Figures 13 and 14. In Figure 13, the doped particles are only distributed in the hot spot area M close to the light incident side. The particle density on the side is higher, and the particle density on the side away from the incident light is lower. The composite dimming film 4 composed of the dimming film 4 and the improvement layer 43 can effectively improve the common hot spot problem on the light incident side.

Example 2

The basic design of the backlight structure in this embodiment is as described in Embodiment 1. This embodiment is only improved on the basis of Embodiment 1, that is, a dimming element 5 is further provided above the dimming film 4, such as shown in Figure 15. The structure of the dimming element 5 is shown in FIG. 16 , and the dimming element 5 includes a base material 51 and a doping material 52 . Wherein, the doping material 52 is composed of rod-shaped molecules, the molecular width is between 50nm and 1000nm, the molecular length is between 500nm and 50um, and the molecular length is 3 times to 50 times the molecular width. Preferably, the molecular length is At least 10 times the width of the molecule. The refractive index difference between the refractive index n1 of the base material 51 and the refractive index n2 of the doping material 52 is between 0.3 and 3. The dopant material 52 can rotate within the base material 51 under a voltage. Under the same doping density, when the doping molecules are in the state 1 of FIG. 17 and the state 2 of FIG. 18 respectively, their effect on the light is different, thus forming different dimming to the outgoing light of the dimming film 4 effect, forming different light-emitting angles. Therefore, under the action of different voltages, the optical element 5 can adjust the light output with a wide viewing angle and a narrow viewing angle, wherein: Figure 17 is a top view of the molecular state of the doping material in the wide viewing angle dimming element 5, and Figure 18 is a narrow viewing angle dimming The top view of the molecular state of the dopant material in the element 5, the strength of the adjustment effect can be controlled by voltage.

To sum up, the present application has designed a backlight structure. Compared with the traditional backlight structure, the dot structure on the light guide plate 3 has no strong scattering of light, so there is no bright light related to the dot structure in the direction perpendicular to the light emitting surface. Spots or poor visibility, which are visible in the conventional light guide plate 3 . In addition, the light-emitting angle of the backlight structure is also reduced, which improves brightness and privacy protection, and reduces product power consumption.

Although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution. This description in the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims

A backlight structure, characterized in that the backlight structure comprises: an illumination component;

A light guide plate, the light guide plate has a light entrance surface, a light exit surface and a light reflection surface, the light entrance surface is perpendicular to and adjacent to the light exit surface, the light entrance surface is located on the side close to the lighting assembly, the light entrance surface is The reflective surface is arranged opposite to the light-emitting surface, the reflective surface is provided with a first surface microstructure, and the contact angle between the tangent of any point on the surface of the first surface microstructure and the reflective surface is not greater than 9° , the light incident surface is set to have a second surface microstructure, the angle between the tangent at any point on the surface of the second surface microstructure and the light incident surface is 30°-70°, and the light exit surface is set to It has a third surface microstructure, the angle between the tangent of any point on the surface of the third surface microstructure and the light incident surface is not greater than 70°, and the light exit angle of the light guide plate is between 65° and 90° ;

A light-adjusting film, the light-adjusting film is located on one side of the light-emitting surface of the light guide plate, the light-adjusting film includes a base material layer and a microstructure layer, and the microstructure layer has a direction parallel to the incident light. Triangular prism strips extending in the face direction and arranged intermittently or continuously;

and a reflection sheet, the reflection sheet is located on one side of the light-reflecting surface of the light guide plate.
The backlight structure of claim 1, wherein the first surface microstructure is a plurality of convex or concave dot microstructures.
The backlight structure according to claim 2, wherein the dot microstructure is a pyramid structure, a pyramid structure or an arc structure.
The backlight structure according to claim 3, wherein the arc structure is one of a partial spherical surface, an ellipsoid or an elliptical paraboloid, and the projection of the arc structure on the reflective surface is a circle or oval.
The backlight structure according to claim 1, wherein the second surface microstructure and/or the third surface microstructure is a convex or concave strip structure.
The backlight structure according to claim 5, wherein the angle between the tangent line at any point on the surface of the strip-shaped structure and the light incident surface or the light exit surface is 30°˜70°.
The backlight structure according to claim 5, wherein the strip-shaped structure is one or more of prism strips, cylindrical strips or trapezoidal strips.
6. The backlight structure according to claim 5, wherein the spacing between the adjacent strip structures is 30 μm˜140 μm.
The backlight structure according to claim 1, wherein the triangular prism strip is located on the side away from the light-emitting surface of the light guide plate, and the bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86 °～90°, the base angle B of the triangular prism strip on the side away from the light incident surface is 66°～74°, and the bottom width L of the triangular prism strip is 6 μm～25 μm.
The backlight structure according to claim 1, wherein the triangular prism strip is located on the side close to the light exit surface of the light guide plate, and the bottom angle C of the triangular prism strip on the side close to the light incident surface is 30 °～80°, the base angle D of the triangular prism strip on the side away from the light incident surface is 30°～80°, and the bottom width P of the triangular prism strip is 5 μm～35 μm.
The backlight structure according to claim 1, wherein the microstructure layer is prepared from a resin material with a refractive index between 1.45 and 1.7.
The backlight structure of claim 1, further comprising an improved layer of doped scattering particles fixed to the side of the light-adjusting film facing away from the light guide plate.
The backlight structure according to claim 12, wherein the scattering particles are distributed in the hot spot area M of the improvement layer close to the light incident surface.
The backlight structure of claim 12, wherein the scattering particles are distributed throughout the improvement layer, and the scattering particles are distributed from a side close to the light incident surface to a side away from the light incident surface. The distribution density of scattering particles in the improvement layer gradually decreases.
The backlight structure according to claim 1, wherein a dimming element is further provided on the side of the dimming film facing away from the light guide plate.
The backlight structure of claim 15, wherein the dimming element comprises a base material and a dopant material, and the dopant material rotates in the base material when electrified.
The backlight structure according to claim 16, wherein the refractive index difference between the refractive index n1 of the base material and the refractive index n2 of the doping material is between 0.05 and 2.5.
The backlight structure of claim 16, wherein the doping material is composed of elongated rod-shaped molecules.
The backlight structure according to claim 18, wherein the width of the rod-shaped molecules is between 50nm and 1000nm, and the length of the rod-shaped molecules is between 500nm and 50um.