A backlight structure

Abstract

The present invention relates to a backlight structure, comprising: an illumination component, a light guide plate, a dimming film, and a reflector located on one side of the reflective surface of the light guide plate. The light guide plate has a light incident surface, a light exit surface, and a reflective surface. Among them, the contact angle between the tangent line at any point on the first surface microstructure surface located on the reflective surface and the reflective surface is not greater than 9°. The included angle between the tangent line at any point on the second surface microstructure surface located on the light incident surface and the light incident surface is 30° - 70°. The included angle between the tangent line at any point on the third surface microstructure surface located on the light exit surface and the light incident surface is not greater than 70°. The dimming film located on one side of the light exit surface of the light guide plate includes a substrate layer and a microstructure layer. The microstructure layer is designed to have triangular prism strips extending along a direction parallel to the light incident surface and arranged discontinuously or continuously. Compared with the traditional backlight structure, this structural design reduces the large-angle light and the light exit angle, and improves the utilization rate of the backlight and the brightness of the backlight.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display backlights, and in particular to a backlight structure. Background Art

[0002] A backlight is an important component applied in the fields of display and lighting, which plays a role in forming a uniform surface light source. The traditional backlight structure usually adds structures such as dots or grooves on the surface of the light guide plate to disrupt the waveguide propagation of light. The light emitted from the light guide plate is diffused by a diffusion film, and then the light is condensed by a brightness enhancement film. The final emission angle of the traditional backlight is usually within ±35° perpendicular to the light-emitting surface. Due to the diffusion effect of the diffusion sheet, the traditional backlight has a relatively large light-emitting angle, and the brightness in the front view direction is limited.

[0003] In addition, in some special industries, such as shopping or account transactions on the Internet, during the above operations, the operator often needs to input personal information on display devices such as computers, mobile phones, ATMs, and ticket vending machines, which is likely to cause the leakage of personal information. A special display device is required to ensure the personal information security of the operator. In particular, confidential information needs to be transmitted to specific personnel, which requires the display device for transmitting information to have anti-peeping performance and the backlight to have a small light-emitting range. Therefore, based on requirements such as improving the brightness of the backlight and reducing the light-emitting angle, a feasible backlight structure design scheme is needed. Summary of the Invention

[0004] This application mainly solves problems such as the relatively large light-emitting angle and limited brightness in the front view direction in the design of the backlight structure, and provides a backlight structure.

[0005] To achieve the above object, the present application provides a backlight structure, which includes: a lighting component; a light guide plate having a light incident surface, a light exit surface and a reflective surface, the light incident surface being perpendicular and adjacent to the light exit surface, the light incident surface being located on the side close to the lighting component, the reflective surface being disposed opposite to the light exit surface, the reflective surface being provided with a first surface microstructure, the tangent of any point on the surface of the first surface microstructure having a contact angle with the reflective surface not greater than 9°, the light incident surface being provided with a second surface microstructure, the tangent of any point on the surface of the second surface microstructure having an angle of 30° to 70° with the light incident surface, the light exit surface being provided with a third surface microstructure, the tangent of any point on the surface of the third surface microstructure having an angle with the light incident surface not greater than 70°, the light exit angle of the light guide plate being between 65° and 90°; a dimming film located on the side of the light exit surface of the light guide plate, the dimming film including a substrate layer and a microstructure layer, the microstructure layer being provided with triangular prism strips extending along a direction parallel to the light incident surface and arranged discontinuously or continuously; a reflective sheet located on the side of the reflective surface of the light guide plate.

[0006] As a further improvement of the present application, the first surface microstructure is a plurality of convex or concave dot microstructures.

[0007] As a further improvement of the present application, the dot microstructure is a pyramid structure, a frustum structure or a curved surface structure.

[0008] As a further improvement of the present application, the curved surface structure is one of a partial spherical surface, an ellipsoidal surface or an elliptic paraboloid surface, and the projection of the curved surface structure on the reflective surface is circular or elliptical.

[0009] 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 structure.

[0010] As a further improvement of the present application, the tangent of any point on the surface of the strip structure has an angle of 30° to 70° with the light incident surface or the light exit surface.

[0011] As a further improvement of the present application, the strip structure is one or more of a prism strip, a cylindrical strip or a trapezoidal strip.

[0012] As a further improvement of the present application, the distance between adjacent strip structures is 30 μm to 140 μm.

[0013] As a further improvement of the present application, the triangular prism strip is located on the side facing away from the light-emitting surface of the light guide plate. The bottom angle A of the triangular prism strip on the side close to the light-incident surface is 86° - 90°, and the bottom angle B of the triangular prism strip on the side far from the light-incident surface is 66° - 74°. The bottom width L of the triangular prism strip is 6μm - 25μm.

[0014] As a further improvement of the present application, the triangular prism strip is located on the side close to the light-emitting surface of the light guide plate. The bottom angle C of the triangular prism strip on the side close to the light-incident surface is 30° - 80°, and the bottom angle D of the triangular prism strip on the side far from the light-incident surface is 30° - 80°. The bottom width P of the triangular prism strip is 5μm - 35μm.

[0015] 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.

[0016] As a further improvement of the present application, it further includes an improvement layer doped with scattering particles fixed to the side of the dimming film facing away from the light guide plate.

[0017] 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.

[0018] As a further improvement of the present application, the scattering particles are distributed throughout the improvement layer, and the distribution density of the scattering particles in the improvement layer gradually decreases from the side close to the light-incident surface to the side facing away from the light-incident surface.

[0019] 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.

[0020] As a further improvement of the present application, the dimming element includes a base material and a doping material, and the doping material rotates within the base material when powered on.

[0021] 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.

[0022] As a further improvement of the present application, the doping material is composed of rod-shaped molecules.

[0023] As a further improvement of the present application, 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.

[0024] The beneficial effects of this application are as follows. Compared with the traditional backlight structure, the backlight structure designed in this application not only reduces large-angle light, improves the utilization rate of the backlight, but also makes the light-emitting angle smaller and improves the brightness of the backlight. In addition, the backlight structure designed in this application also avoids optical defects such as hot spots or uneven brightness and darkness caused by the lighting component on the light-incident surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic perspective view of the backlight structure according to an embodiment;

[0026] Figure 2 is a front view of the backlight structure according to an embodiment;

[0027] Figure 3 is a front view of the light guide plate structure;

[0028] Figure 4 is a top view of the light guide plate structure;

[0029] Figure 5 is a left view of the light guide plate structure;

[0030] Figure 6 is a diagram of the strip structure type in the second surface microstructure and / or the third surface microstructure;

[0031] Figure 7 is a schematic diagram of the strip structure angle in the second surface microstructure and / or the third surface microstructure;

[0032] Figure 8 is a front view of the dimming film structure according to an embodiment;

[0033] Figure 9 is a schematic diagram of light correction of the dimming film structure according to an embodiment;

[0034] Figure 10 is a front view of the dimming film structure according to another embodiment;

[0035] Figure 11 is a schematic diagram of light correction of the dimming film structure according to another embodiment;

[0036] Figure 12 is a schematic diagram of the composite dimming film structure;

[0037] Figure 13 is an improved layer doping particle distribution in an embodiment of the composite dimming film;

[0038] Figure 14 is an improved layer doping particle distribution in another embodiment of the composite dimming film;

[0039] Figure 15 is a front view of the backlight structure according to another embodiment;

[0040] Figure 16 It is a schematic structural diagram of the dimming element;

[0041] Figure 17 It is a top view of the molecular state of the doping material in the dimming element under a wide viewing angle;

[0042] Figure 18 It is a top view of the molecular state of the doping material in the dimming element under a narrow viewing angle;

[0043] In the figure: 1. Lighting component; 2. Reflective sheet; 3. Light guide plate; 4. Dimming film; 5. Dimming element; 31. First surface microstructure; 32. Second surface microstructure; 33. Third surface microstructure; 41. Substrate layer; 42. Microstructure layer; 43. Improvement layer; 51. Base material; 52. Doping material. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with 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, rather than all of the embodiments, and are not used 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 efforts shall fall within the scope of protection of the present application.

[0045] In view of the problems in the existing backlight structure design, such as a relatively large light-emitting angle and limited brightness in the front view direction, the embodiment of the present application provides a backlight structure. The backlight structure includes an illumination component 1, a light guide plate 3, a dimming film 4, and a reflector 2 located on the reflective surface side of the light guide plate 3. Among them: the illumination component 1 is further preferably an LED light source; the light guide plate 3 has a light-incident surface, a light-emitting surface, and a reflective surface. The light-incident surface is perpendicular and adjacent to the light-emitting surface. The light-incident surface is located on the side close to the illumination component 1. The reflective surface is disposed opposite to the light-emitting surface. The reflective surface is provided with a first surface microstructure 31. The contact angle between the tangent line of any point on the surface of the first surface microstructure 31 and the reflective surface is not greater than 9°. The light-incident surface is provided with a second surface microstructure 32. The angle between the tangent line of any point on the surface of the second surface microstructure 32 and the light-incident surface is 30° - 70°. The light-emitting surface is provided with a third surface microstructure 33. The angle between the tangent line of any point on the surface of the third surface microstructure 33 and the light-incident surface is not greater than 70°. The above structural design of the light guide plate enables the light-emitting angle of the light guide plate 3 to be between 65° and 90°; the dimming film 4 is located on the light-emitting surface side of the light guide plate 3. The dimming film 4 includes a substrate layer 41 and a microstructure layer 42. The microstructure layer 42 is composed of triangular prism strips extending in a direction parallel to the light-incident surface and arranged intermittently.

[0046] In the present application, as a preferred implementation, the cross-sectional structure of the triangular prism strip is an isosceles triangle or a non-isosceles triangle. The main function of the dimming film 4 is to correct the light emitted from the light guide plate 3. The microstructure layer 42 is prepared from 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 with the above structure corrects the light angle coming out of the backlight structure within the range of ±15° perpendicular to the light-emitting surface, while reducing the large-angle light and gathering more light in a small light-emitting range, improving the front view brightness of the backlight.

[0047] In the present application, as a preferred implementation, the first surface microstructure 31 is a plurality of convex or concave dot microstructures. As a further preferred implementation, the dot microstructure is a pyramid structure, a frustum structure, or a curved surface structure. As an even more preferred implementation, the curved surface structure is one of a partial spherical surface, an ellipsoidal surface, or an elliptic paraboloid surface. The projection of the curved surface structure on the reflective surface is a circle or an ellipse.

[0048] In the present application, as a preferred embodiment, the second surface microstructure 32 and / or the third surface microstructure 33 is a convex or concave strip structure. 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° to 70°. As a further preferred embodiment, the strip structure is one or more of a prismatic strip, a cylindrical strip or a trapezoidal strip. Preferably, the spacing between adjacent strip structures is 30μm to 140μm.

[0049] In the present application, as a preferred implementation scheme, the triangular prism strip is located on the side away from the light emitting surface of the light guide plate 3, the base angle A of the triangular prism strip close to the light incident surface is 86°~90°, the base angle B of the triangular prism strip away from the light incident surface is 66°~74°, and the bottom width L of the triangular prism strip is 6μm~25μm; the triangular prism strip is located on the side close to the light emitting surface of the light guide plate 3, the base angle C of the triangular prism strip close to the light incident surface is 30°~80°, the base angle D of the triangular prism strip away from the light incident surface is 30°~80°, and the bottom width P of the triangular prism strip is 5μm~35μm.

[0050] In the present application, as a preferred embodiment, it further includes an improved layer 43 doped with scattering particles fixed to the side of the dimming 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 improved layer 43 close to the light incident surface; the scattering particles are distributed throughout the improved layer 43, and the distribution density of the scattering particles in the improved layer 43 gradually decreases from the side close to the light incident surface to the side away from the light incident surface.

[0051] In the present application, as a preferred embodiment, a dimming element 5 is further provided on the side of the dimming 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 output through the dimming film 4±15°, while increasing the brightness, increasing the adjustment of the viewing angle range. The dimming element 5 includes a base material 51 and a doping material 52, and the doping material 52 rotates in the base material 51 when energized. 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 the width. Further preferably, 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.

[0052] The backlight source structure of a specific implementation mode of the present application is described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] This embodiment provides a backlight structure, as Figure 1 and Figure 2 shown. The backlight structure consists of an LED light source assembly, a bottom reflector 2, a light guide plate 3, and a dimming film 4; the bottom reflector 2 reflects the light incident on the bottom back into the light guide plate 3 to improve the light utilization rate; the light guide plate 3 can form a uniform surface light source from the light propagated by waveguides; the dimming film 4 corrects the light emitted from the light guide plate 3.

[0055] In this embodiment, the structure of the light guide plate 3 is as Figure 3 shown. The light guide plate 3 has a reflective surface, a light incident surface, and a light exit surface; a first surface microstructure 31 is formed on the reflective surface by processes such as bumping and precision machining; the first surface microstructure 31 can be, but is not limited to, concave or convex pyramid, arc-shaped, and other structures; its main feature is that the angle between the tangent at each point on the first surface microstructure 31 and the horizontal direction is less than 9°.

[0056] In this embodiment, a second surface microstructure 32 is provided on the light incident surface of the light guide plate 3 near the LED light source side, and the arrangement of the second surface microstructure 32 is as Figure 4 and Figure 5 shown. The second surface microstructure 32 is a strip-shaped structure that is convex or concave outward, and can be, but is not limited to, prism strips, cylindrical strips, trapezoidal strips, etc., as Figure 6 shown. In this embodiment, the extending direction of the strip-shaped structure of the second surface microstructure 32 is Figure 5 the Y direction arrangement in Figure 4 , and the arrangement direction of the strip-shaped structure of the second surface microstructure 32 is Figure 7 the Z direction in; the distance between adjacent strip-shaped structures in the second surface microstructure 32 is 30 um to 140 um, and adjacent strip-shaped structures can also be arranged closely; the angle β between the tangent at any point on any strip-shaped structure in the second surface microstructure 32 and the horizontal plane is 30° to 70°, and the angle marking is shown as

[0057] 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 as Figure 4 and Figure 5 shown. The third surface microstructure 33 can be a strip-shaped structure that is convex or concave outward, and the strip-shaped structure can be, but is not limited to, prism strips, cylindrical strips, etc., as Figure 6 shown. In this embodiment, the extending direction of the strip-shaped structure of the third surface microstructure 33 is Figure 4 the X direction arrangement in Figure 5in the Z direction; the distance between adjacent strip structures in the third surface microstructure 33 is 30 um to 140 um, and the adjacent strip structures can also be arranged closely; the angle between the tangent line at any point on any strip structure on the third surface microstructure 33 and the horizontal plane is not greater than 70°. In this embodiment, the angle between the tangent line at any point on any strip structure on the third surface microstructure 33 and the horizontal plane is 30° to 70°. This angle can be, for example, continuously changing along the microstructure surface, or a single fixed angle, or a discontinuous change or a random change. This will not be elaborated here. The angle identification is shown as Figure 7 shown.

[0058] In this embodiment, by providing 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 LED forms a narrow-angle light-emitting range of 65° to 90° after passing through the light guide plate 3.

[0059] In this embodiment, a dimming film 4 is further provided above the light guide plate 3. The main function of the dimming film 4 is to correct the light emitted from the light guide plate 3. The dimming film 4 includes a substrate layer 41 and a microstructure layer 42, as Figure 8 and Figure 10 shown. The microstructure layer 42 is arranged in a triangular prism strip pattern. The extension direction of the triangle is the Z direction, and the arrangement direction is the X direction. The microstructure layer 42 is made of a resin material with a refractive index between 1.45 and 1.7. Figure 8 is a schematic structural diagram of an embodiment of the dimming film 4. The microstructure layer 42 is arranged in a non-isosceles triangular prism strip pattern. The cross-sectional structure of the microstructure layer 42 is as Figure 9 shown. The bottom angle A of the prism strip near the light-incident side of the light guide plate 3 is 86° to 90°, and the bottom angle B of the prism strip far from the light-incident surface side is 66° to 74°. The bottom width L of the non-isosceles triangle is 6 um to 25 um. Figure 10 is a schematic structural diagram of another embodiment of the dimming film 4. The microstructure layer 42 is arranged in an isosceles triangular or non-isosceles triangular prism strip pattern. The cross-sectional structure of the microstructure layer 42 is as Figure 11 shown. The bottom angle C of the prism strip near the light-incident side of the light guide plate 3 is 30° to 80°, and the bottom angle D of the prism strip far from the light-incident surface side is 30° to 80°. The bottom width P of the prism strip structure is 5 um to 35 um. The dimming film 4 composed of the substrate layer 41 and the microstructure layer 42 can reduce large-angle light and correct the light-emitting angle of the light guide plate 3 to within ±15° perpendicular to the light-emitting surface, improving the front-view brightness of the backlight. The principle structure of its light correction is as Figure 9 and Figure 11 shown.

[0060] In this embodiment, an improvement layer 43 is further provided above the dimming film 4, asFigure 12 As shown in the figure. In the improvement layer 43, the light emission from the hot spot area M is homogenized by doping scattering particles. The distribution of doping examples is as Figure 13 and Figure 14 shown. Figure 13 In [description of the figure], the doping particles are only distributed in the hot spot area M near the light incident side. Figure 14 In [description of the figure], the density of the doping particles shows a changing trend in the X direction. The particle density is larger near the light incident side and smaller away from the light incident side. 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.

[0061] Embodiment 2

[0062] 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, as Figure 15 shown. The structure of the dimming element 5 is as Figure 16 shown. The dimming element 5 includes a base material 51 and a doping material 52. Among them, the doping material 52 is composed of rod-shaped molecules, the molecular width of which is between 50 nm and 1000 nm, the molecular length is between 500 nm and 50 μm, and the molecular length is 3 to 50 times the molecular width. Preferably, the molecular length is at least 10 times the molecular width. 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 doping material 52 can rotate within the base material 51 under voltage. At the same doping density, when the doping molecules are in Figure 17 state 1 of Figure 18 and Figure 17 state 2 of Figure 18 respectively, their effects on light are different, thus forming different dimming effects on the outgoing light of the dimming film 4 and forming different light-emitting viewing angles. Therefore, under the action of different voltages, the optical element 5 adjusts the light emission to form a wide viewing angle and a narrow viewing angle, where:

[0063] In summary, by designing a backlight structure, compared with the traditional backlight structure, there is no strong scattering of light in the dot structure on the light guide plate 3. Therefore, there are no bright spots or poor visibility related to the dot structure in the direction perpendicular to the light-emitting surface, which are visible in the traditional light guide plate 3. In addition, the light-emitting angle of the backlight structure is reduced, which improves the brightness and anti-peeping effect; and the power consumption of the product is reduced.

[0064] Although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0065] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight structure, characterized in that, The backlight source structure includes: a lighting component; A light guide plate, the light guide plate having a light incident surface, a light emitting surface and a light reflecting surface, the light incident surface being perpendicular to and adjacent to the light emitting surface, the light incident surface being located on a side close to the lighting assembly, the light reflecting surface being arranged relative to the light emitting surface, the light reflecting surface being arranged to have a first surface microstructure, the contact angle between a tangent at any point on the surface of the first surface microstructure and the light reflecting surface being not greater than 9°, the light incident surface being arranged to have a second surface microstructure, the angle between a tangent at any point on the surface of the second surface microstructure and the light incident surface being 30° to 70°, the light emitting surface being arranged to have a third surface microstructure, the angle between a tangent at any point on the surface of the third surface microstructure and the light incident surface being not greater than 70°, and the light emitting angle of light of the light guide plate being between 65° and 90°; A dimming film, the dimming film is located on the light emitting surface side of the light guide plate, the dimming film comprises a substrate layer and a microstructure layer, the microstructure layer comprises triangular prism strips extending in a direction parallel to the light incident surface and arranged discontinuously or continuously, and the microstructure layer is made of a resin material with a refractive index between 1.45 and 1.7; A reflective sheet, the reflective sheet is located on one side of the reflective surface of the light guide plate; It also includes an improvement layer doped with scattering particles and fixed to the side of the dimming film facing away from the light guide plate.

2. The backlight structure according to claim 1, characterized in that The first surface microstructure is a plurality of convex or concave dot microstructures.

3. The backlight structure according to claim 2, characterized in that, The dot microstructure is a pyramid structure, a prism structure or a curved surface structure.

4. The backlight structure according to claim 3, wherein, The arc surface structure is one of a partial sphere, an ellipsoid or an elliptical parabola, and the projection of the arc surface structure on the reflective surface is circular or elliptical.

5. The backlight structure according to claim 1, wherein The second surface microstructure and / or the third surface microstructure is a convex or concave stripe structure.

6. The backlight structure according to claim 5, wherein The angle between a tangent line at any point on the surface of the strip structure and the light incident surface or the light emitting surface is 30° to 70°.

7. The backlight structure according to claim 5, characterized in that, The strip-shaped structure is one or more of a prism strip, a cylindrical strip or a trapezoidal strip.

8. The backlight structure according to claim 5, characterized in that, The spacing between adjacent strip structures is 30 μm to 140 μm.

9. 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, the base angle A of the triangular prism strip close to the light incident surface is 86° to 90°, the base angle B of the triangular prism strip away from the light incident surface is 66° to 74°, and the bottom width L of the triangular prism strip is 6μm to 25μm.

10. The backlight structure according to claim 1, characterized in that The triangular prism strip is located on a side close to the light emitting surface of the light guide plate, a base angle C of the triangular prism strip close to the light incident surface is 30° to 80°, a base angle D of the triangular prism strip away from the light incident surface is 30° to 80°, and a bottom width P of the triangular prism strip is 5μm to 35μm.

11. The backlight structure according to claim 1, wherein The scattering particles are distributed in a hot spot area M of the improvement layer close to the light incident surface.

12. The backlight structure according to claim 1, wherein, The scattering particles are distributed in the entire improvement layer, and the distribution density of the scattering particles in the improvement layer gradually decreases from a side close to the light incident surface to a side away from the light incident surface.

13. The backlight structure according to claim 1, characterized in that, A dimming element is also provided on the side of the dimming film away from the light guide plate.

14. The backlight structure according to claim 13, wherein The dimming element includes a base material and a doping material, and the doping material rotates within the base material when powered on.

15. The backlight structure according to claim 14, characterized in that, 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.

16. The backlight structure according to claim 14, characterized in that, The doping material is composed of elongated rod-shaped molecules.

17. The backlight structure according to claim 16, wherein, The width of the rod-shaped molecules is between 50 nm and 1000 nm, and the length of the rod-shaped molecules is between 500 nm and 50 μm.

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