Dimming assembly, backlight module and display device

Abstract

A dimming assembly comprises a first prism sheet (11), a second prism sheet (12) and an auxiliary film (14), wherein the first prism sheet (11) and the second prism sheet (12) are oppositely arranged, and the auxiliary film (14) is located on the side, away from the second prism sheet (12), of the first prism sheet (11). The first prism sheet (11) includes a plurality of first dimming portions (130) extending in a first direction (D1) and arranged in an array. The second prism sheet (12) comprises a plurality of second dimming parts (140) which extend in the second direction (D2) and are arranged in an array. The included angle between the third direction (X) and the first direction (D1) is a first cutting angle (a1), and the included angle between the third direction (X) and the second direction (D2) is a second cutting angle (a2). The absolute value of the second cut angle (a2) is larger than the absolute value of the first cut angle (a1), and the absolute values of the first cut angle (a1) and the second cut angle (a2) are larger than or equal to 0 degree and smaller than 90 degrees.

Description

Dimming component, backlight module and display device Technical Field

[0001] This article relates to but is not limited to the field of display technology, and in particular to a dimming component, a backlight module and a display device. Background Art

[0002] With the development of technology, displays have been widely used in different fields and are inseparable from people's work, study, and life. Nowadays, people have higher and higher demands on the performance of displays. How to create products with higher brightness and higher picture quality is a major challenge facing the display industry. Especially with the rise of the concept of low carbon and environmental protection in recent years, people have higher and higher requirements for the power consumption of displays. In order to meet the ES8.0 standard, display manufacturers add a reflective polarizing brightening film (DBEF, Dual Brightness Enhancement Film) to the backlight module. However, conventional backlight modules using DBEF cannot meet the requirements of the Swedish Labor Confederation (TCO, The TCO standard, promoted by the Swedish Labor Confederation, is a display certification standard and is currently one of the most widely recognized certifications in the display industry. Improving brightness while maintaining viewing angles has become a major challenge in the industry.

[0003] Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] Embodiments of the present disclosure provide a dimming component, a backlight module, and a display device.

[0006] In one aspect, this embodiment provides a dimming assembly comprising: a first prism sheet and a second prism sheet disposed opposite each other, and an auxiliary film located on a side of the first prism sheet away from the second prism sheet. The first prism sheet has opposing first and second surfaces, the first surface including a plurality of first dimming portions extending in a first direction and arranged in an array. The second prism sheet has opposing third and fourth surfaces, the third surface located on a side of the second prism sheet closer to the first prism sheet, the third surface including a plurality of second dimming portions extending in a second direction and arranged in an array. The first prism sheet further comprises at least one first side surface extending in a third direction and connecting the first and second surfaces; the second prism sheet further comprises at least one second side surface extending in the third direction and connecting the third and fourth surfaces. The angle between the third direction and the first direction is the first cutting angle of the first prism sheet, and the angle between the third direction and the second direction is the second cutting angle of the second prism sheet. The absolute value of the second cutting angle of the second prism sheet is greater than the absolute value of the first cutting angle of the first prism sheet, and the absolute values ​​of the first and second cutting angles are greater than or equal to 0 and less than 90 degrees.

[0007] In some exemplary embodiments, an absolute value of the first cutting angle is greater than or equal to 0 and less than or equal to 15 degrees.

[0008] In some exemplary embodiments, an absolute value of the first cutting angle is greater than or equal to 3 degrees and less than or equal to 10 degrees.

[0009] In some exemplary embodiments, a difference between an absolute value of the first cutting angle and an absolute value of the second cutting angle ranges from 45 degrees to 75 degrees.

[0010] In some exemplary embodiments, an absolute value of the second cutting angle is greater than or equal to 60 degrees and less than or equal to 75 degrees.

[0011] In some exemplary embodiments, an absolute value of the second cutting angle is greater than or equal to 65 degrees and less than or equal to 70 degrees.

[0012] In some exemplary embodiments, the first cutting angle is 5 degrees, and the second cutting angle is 75 degrees.

[0013] In some exemplary embodiments, the haze of the first prism sheet and the haze of the second prism sheet are both in a range of 10% to 45%, and the haze of the first prism sheet is smaller than the haze of the second prism sheet.

[0014] In some exemplary embodiments, the haze of the first prism sheet ranges from 15% to 30%, and the haze of the second prism sheet ranges from 25% to 45%.

[0015] In some exemplary embodiments, the haze of the first prism sheet is 15%, and the haze of the second prism sheet is 40%.

[0016] In some exemplary embodiments, the first dimming portion of the first prism sheet has two first extended surfaces extending along a first direction. In a cross section perpendicular to the second surface and perpendicular to the first direction, the ends of the two first extended surfaces distal from the second surface intersect to form a first intersection line. The distance between adjacent first intersection lines is a first dimming period. The second dimming portion of the second prism sheet has two second extended surfaces extending along the second direction. In a cross section perpendicular to the fourth surface and perpendicular to the second direction, the ends of the two second extended surfaces distal from the fourth surface intersect to form a second intersection line. The distance between adjacent second intersection lines is a second dimming period. The first dimming period and the second dimming period range from 25 microns to 50 microns.

[0017] In some exemplary embodiments, the first dimming period and the second dimming period are in a range of 30 microns to 45 microns.

[0018] In some exemplary embodiments, the first dimming portion of the first prism sheet has two first extension surfaces extending along the first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, the angle between the two first extension surfaces ranges from 87 degrees to 92 degrees; the second dimming portion of the second prism sheet has two second extension surfaces extending along the second direction, and in a cross section perpendicular to the fourth surface and perpendicular to the second direction, the angle between the two second extension surfaces ranges from 87 degrees to 92 degrees.

[0019] In some exemplary embodiments, the refractive index of the first light modulating part of the first prism sheet and the second light modulating part of the second prism sheet ranges from 1.45 to 1.7.

[0020] In some exemplary embodiments, the refractive index of the first light modulating part of the first prism sheet and the second light modulating part of the second prism sheet ranges from 1.52 to 1.61.

[0021] In some exemplary embodiments, the dimming component further includes a diffusion sheet located on a side of the second prism sheet away from the first prism sheet, configured to diffuse the transmitted light and direct the diffused light toward the second prism sheet.

[0022] On the other hand, this embodiment provides a backlight module, including a light source assembly and the dimming assembly described above, wherein the light source assembly is configured to generate light directed toward the dimming assembly.

[0023] On the other hand, this embodiment provides a display device, including the backlight module as described above and a liquid crystal panel located on the light-emitting side of the backlight module.

[0024] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0025] Summary of the Figures

[0026] The accompanying drawings are used to provide a further understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation to the technical solution of the present disclosure.

[0027] FIG1 is a schematic diagram of the optical principle of DBEF;

[0028] FIG2A is a full-viewing angle distribution diagram of the brightness of a backlight module without DBEF;

[0029] FIG2B is a full-viewing angle distribution diagram of the brightness of a backlight module using DBEF;

[0030] FIG3 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0031] FIG4 is a schematic cross-sectional view of a first prism sheet according to at least one embodiment of the present disclosure;

[0032] FIG5 is a schematic cross-sectional view of a second prism sheet according to at least one embodiment of the present disclosure;

[0033] FIG6 is a schematic top view of a first prism sheet according to at least one embodiment of the present disclosure;

[0034] FIG7 is a schematic top view of a second prism sheet according to at least one embodiment of the present disclosure;

[0035] FIG8A is a schematic diagram of a display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure;

[0036] FIG8B is an observation diagram of the liquid crystal panel shown in FIG8A when measuring the horizontal viewing angle;

[0037] FIG8C is an observation diagram of the liquid crystal panel shown in FIG8A when measuring a vertical viewing angle;

[0038] FIG9A is a full-viewing angle distribution diagram of a backlight module based on the DPP architecture;

[0039] FIG9B is a full viewing angle distribution diagram of a backlight module based on the DBEF+DPP architecture;

[0040] FIG10 is a comparison diagram of the brightness curves of a backlight module based on a DPP architecture and a backlight module based on a DBEF+DPP architecture;

[0041] FIG11 is a schematic diagram of a test of polarized light intensity;

[0042] FIG12A is a brightness curve diagram of a backlight module based on a DPP architecture as the polarizer rotates;

[0043] FIG12B is a brightness curve diagram of a backlight module based on a DBEF+DPP architecture as the polarizer rotates;

[0044] FIG13A is a full-viewing angle distribution diagram of haze variation of a first prism sheet of a backlight module based on a DPP architecture;

[0045] FIG13B is a full-viewing angle distribution diagram of haze variation of the first prism sheet of the backlight module based on the DBEF+DPP architecture;

[0046] FIG14A is a full-viewing angle distribution diagram of haze variation of the second prism sheet of a backlight module based on the DPP architecture;

[0047] FIG14B is a full-viewing angle distribution diagram of haze variation of the second prism sheet of the backlight module based on the DBEF+DPP architecture;

[0048] FIG15 is a schematic diagram of light emitted from the first prism sheet;

[0049] FIG16 is a schematic diagram of the main deflection direction of the emitted light;

[0050] FIG. 17 is a schematic diagram of a display device according to at least one embodiment of the present disclosure.

[0051] Details

[0052] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The embodiments can be implemented in a variety of different forms. A person skilled in the art can easily understand that the method and content can be transformed into other forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other in any manner.

[0053] In the drawings, the size of one or more components, layer thicknesses, or regions may be exaggerated for clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to these dimensions, and the shapes and sizes of one or more components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and one embodiment of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0054] In this specification, ordinal numbers such as "first," "second," and "third" are provided to avoid confusion among constituent elements, and are not intended to limit the number. "Multiple" in this disclosure means two or more.

[0055] In this specification, for convenience, words and phrases indicating orientation or positional relationships, such as "middle," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside," are used to illustrate the positional relationships of constituent elements with reference to the accompanying drawings. This is merely for the purpose of facilitating the description of this specification and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure. The positional relationships of constituent elements may be appropriately changed depending on the orientation of the constituent elements being described. Therefore, the present disclosure is not limited to the words and phrases described in the specification and may be appropriately replaced depending on the circumstances.

[0056] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; they can refer to mechanical connections or connections; they can refer to direct connections, indirect connections through intermediaries, or internal communication between two components. Those skilled in the art will understand the meaning of these terms in this disclosure based on the circumstances.

[0057] In this specification, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus also includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus also includes a state where the angle is greater than 85° and less than 95°.

[0058] In this specification, circles, ellipses, triangles, rectangles, trapezoids, pentagons or hexagons are not in the strict sense, but may be approximate circles, approximate ellipses, approximate triangles, approximate rectangles, approximate trapezoids, approximate pentagons or approximate hexagons, etc. There may be some small deformations caused by tolerances, such as chamfers, arc edges and deformations.

[0059] In this disclosure, the terms "approximately" and "substantially" are used without strict boundaries, allowing for process and measurement errors. In this disclosure, "substantially the same" means that the values ​​differ by no more than 10%. In this disclosure, the term "symmetrical" is used without strict boundaries, allowing for approximately symmetric values ​​within the range of process and measurement errors.

[0060] In some implementations, the liquid crystal display device mainly includes a backlight module and a liquid crystal panel arranged on the light-emitting side of the backlight module. The backlight module can provide a surface light source to the liquid crystal panel so that the liquid crystal panel can display images normally. The backlight module mainly includes: a light source component and a dimming component arranged on the light-emitting side of the light source component. During display, the light emitted by the light source component passes through the dimming component and is emitted to the liquid crystal panel, so that the liquid crystal panel can display images normally. The dimming component usually adopts an optical film prism sheet, which can use optical refraction to form a brightness improvement at the central viewing angle. For example, the dimming component can use two prism sheets stacked with mutually perpendicular prism angles (for example, the cutting angle of the upper prism sheet is 0 degrees and the cutting angle of the lower prism sheet is 90 degrees) to converge the horizontal and vertical light to the positive viewing angle (i.e., 0 degree viewing angle), thereby improving the display brightness at the positive viewing angle, so that the liquid crystal display device obtains a higher brightness gain. To further enhance the backlight unit's brightness while meeting power consumption requirements, a dimming assembly can include two stacked prism sheets with prisms at perpendicular angles, and an auxiliary film (e.g., DBEF) located on the light-emitting side of the two prism sheets. However, current dimming assemblies cannot meet the viewing angle requirements of the TCO 8.0 standard.

[0061] This embodiment provides a dimming component, a backlight module, and a display device, which can take into account both brightness and viewing angle requirements, and provide better brightness gain while meeting the viewing angle requirements of the TCO8.0 standard.

[0062] This embodiment provides a dimming assembly, comprising: a first prism sheet and a second prism sheet disposed opposite each other, and an auxiliary film located on a side of the first prism sheet away from the second prism sheet. The first prism sheet has opposing first and second surfaces, the first surface including a plurality of first dimming portions extending in a first direction and arranged in an array. The second prism sheet has opposing third and fourth surfaces, the third surface located on a side of the second prism sheet closer to the first prism sheet, the third surface including a plurality of second dimming portions extending in a second direction and arranged in an array. The first prism sheet further has at least one first side surface extending in a third direction and connecting the first and second surfaces; the second prism sheet further has at least one second side surface extending in the third direction and connecting the third and fourth surfaces. The angle between the third direction and the first direction is the first cutting angle of the first prism sheet, and the angle between the third direction and the second direction is the second cutting angle of the second prism sheet. The absolute value of the second cutting angle of the second prism sheet is greater than the absolute value of the first cutting angle of the first prism sheet, and the absolute values ​​of the first and second cutting angles are greater than or equal to 0 and less than 90 degrees.

[0063] In some examples, the auxiliary film may be a reflective polarization enhancement film (DBEF).

[0064] In this example, the sign of the angle indicates the direction of rotation, not the magnitude. A positive angle indicates a counterclockwise rotation, and a negative angle indicates a clockwise rotation.

[0065] The dimming component provided in this embodiment can achieve high brightness while ensuring that the TCO viewing angle requirements are met by setting the angle range of the first cutting angle of the first prism sheet and the second cutting angle of the second prism sheet and the size relationship between the two, thereby helping to improve the performance of the display product.

[0066] In some exemplary embodiments, the absolute value of the first cutting angle may be greater than or equal to 0 and less than or equal to 15 degrees. In some examples, the absolute value of the first cutting angle may be greater than or equal to 3 degrees and less than or equal to 10 degrees. The angle range of the first cutting angle of this example can achieve further brightness gain.

[0067] In some exemplary embodiments, the difference between the absolute value of the first cutting angle and the absolute value of the second cutting angle may range from 45 degrees to 75 degrees. In some examples, the absolute value of the second cutting angle may be greater than or equal to 60 degrees and less than or equal to 75 degrees. In some examples, the absolute value of the second cutting angle may be greater than or equal to 65 degrees and less than or equal to 70 degrees. The angle range of the second cutting angle in this example can take into account both viewing angle and brightness requirements.

[0068] In some exemplary embodiments, the haze of the first prism sheet and the haze of the second prism sheet may both range from 10% to 45% (i.e., greater than or equal to 10% and less than or equal to 45%). The haze of the first prism sheet may be smaller than the haze of the second prism sheet. In some examples, the haze of the first prism sheet may range from 15% to 30% (i.e., greater than or equal to 15% and less than or equal to 30%), and the haze of the second prism sheet may range from 25% to 45% (i.e., greater than or equal to 25% and less than or equal to 45%). For example, the haze of the first prism sheet may be 15%, and the haze of the second prism sheet may be 40%. The haze ranges of the first prism sheet and the second prism sheet in this example can achieve both viewing angle and brightness requirements.

[0069] In some exemplary embodiments, the first dimming portion of the first prism sheet may have two first extension surfaces extending along a first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, the ends of the two first extension surfaces away from the second surface intersect to form a first intersection line; the distance between adjacent first intersection lines is a first dimming period. The second dimming portion of the second prism sheet may have two second extension surfaces extending along a second direction, and in a cross section perpendicular to the fourth surface and perpendicular to the second direction, the ends of the two second extension surfaces away from the fourth surface intersect to form a second intersection line, and the distance between adjacent second intersection lines is a second dimming period. The first dimming period and the second dimming period may range from 25 microns to 50 microns. In some examples, the first dimming period and the second dimming period may range from 30 microns to 45 microns. The setting range of the first dimming period and the second dimming period in this example can achieve a balance between viewing angle and brightness requirements.

[0070] In some exemplary embodiments, the first dimming portion of the first prism sheet may have two first extension surfaces extending along the first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, the angle between the two first extension surfaces ranges from 87 degrees to 92 degrees, for example, it may be approximately 90 degrees. The angle between the two first extension surfaces is the vertex angle of the first dimming portion. The second dimming portion of the second prism sheet may have two second extension surfaces extending along the second direction, and in a cross section perpendicular to the fourth surface and perpendicular to the second direction, the angle between the two second extension surfaces ranges from 87 degrees to 92 degrees, for example, it may be approximately 90 degrees. The angle between the two second extension surfaces is the vertex angle of the second dimming portion. The vertex angle setting range of the first dimming portion and the second dimming portion in this example can achieve higher brightness.

[0071] In some exemplary embodiments, the refractive index of the first dimming unit of the first prism sheet and the second dimming unit of the second prism sheet may range from 1.45 to 1.7. In some examples, the refractive index of the first dimming unit of the first prism sheet and the second dimming unit of the second prism sheet may range from 1.52 to 1.61. The refractive index setting range of the first dimming unit and the second dimming unit in this example can help improve brightness and ensure scratch resistance.

[0072] The solution of this embodiment is described below by using some examples. In the following examples, the auxiliary film is DBEF as an example.

[0073] Figure 1 is a schematic diagram of the optical principle of DBEF. As shown in Figure 1, a first polarizer (also called an upper polarizer) 21 and a second polarizer (also called a lower polarizer) 22 can be respectively set on both sides of the liquid crystal panel 20. The DBEF 31 can be set between the light source assembly 30 and the first polarizer 21. Because light waves are transverse waves, the vibration direction of the light waves is perpendicular to the propagation direction. The light can be divided into P waves whose vibration direction is in the plane formed by the incident light and the normal, and S waves whose vibration direction is perpendicular to the plane formed by the incident light and the normal. The P wave is parallel to the light vibration plane, and the S wave is perpendicular to the light vibration plane. The core principle of DBEF 31 is to use a multi-layer thin film structure to convert the polarization state of the incident light in the lower layer into light in a direction that can be transmitted by the first polarizer 21. For example, the P wave of the incident light is consistent with the polarization direction of the first polarizer 21 and can pass through the first polarizer 21. The DBEF 31 can reflect the S wave of the incident light and direct the P wave of the incident light toward the first polarizer 21 , thereby increasing the light transmittance of the first polarizer 21 and thus increasing the brightness of the liquid crystal panel 20 .

[0074] Figure 2A is a full-viewing angle distribution diagram of the brightness of a backlight module without DBEF. Figure 2B is a full-viewing angle distribution diagram of the brightness of a backlight module with DBEF. The dimming component of the backlight module corresponding to Figure 2A may include two stacked prism sheets with mutually perpendicular prism angles, and the dimming component of the backlight module corresponding to Figure 2B may include two stacked prism sheets with mutually perpendicular prism angles and a DBEF located on the light-emitting side of the two prism sheets. In the full-viewing angle distribution diagram, the horizontal axis represents the horizontal viewing angle, the vertical axis represents the vertical viewing angle, and different brightness levels are represented by different grayscales.

[0075] As shown in Figures 2A and 2B, DBEF has a relatively high haze, which will rearrange the full-view optical shape of the backlight module. Therefore, the current backlight module using DBEF still has the problem of not meeting the viewing angle requirements of the TCO standard.

[0076] The dimming component provided in this embodiment can achieve high brightness while ensuring that the TCO viewing angle requirements are met by setting the angle range of the first cutting angle of the first prism sheet and the second cutting angle of the second prism sheet and the size relationship between the two, thereby helping to improve the performance of the display product.

[0077] Figure 3 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure. Figure 4 is a schematic cross-sectional diagram of a first prism sheet according to at least one embodiment of the present disclosure. Figure 5 is a schematic cross-sectional diagram of a second prism sheet according to at least one embodiment of the present disclosure. Figure 6 is a schematic top view of a first prism sheet according to at least one embodiment of the present disclosure. Figure 7 is a schematic top view of a second prism sheet according to at least one embodiment of the present disclosure. Figure 4 shows a cross-section of the first prism sheet perpendicular to the second plane M2 and perpendicular to the first direction D1. Figure 5 shows a cross-section of the second prism sheet perpendicular to the fourth plane M4 and perpendicular to the second direction D2.

[0078] In some examples, as shown in Figures 3 to 7, the dimming assembly of this example may include: a first prism sheet 11, a second prism sheet 12, a DBEF 14, and a diffuser 13. The first prism sheet 11 and the second prism sheet 12 are arranged opposite each other. For example, the diffuser 13, the second prism sheet 12, the first prism sheet 11, and the DBEF 14 may be arranged in sequence on the light output side of the light source assembly. The first prism sheet 11 may be located on the light output side of the second prism sheet 12, and the DBEF 14 may be located on the light output side of the first prism sheet 11. In some examples, the first prism sheet 11 may be referred to as an upper prism sheet, and the second prism sheet 12 may be referred to as a lower prism sheet.

[0079] In some examples, as shown in Figures 3, 4, and 6, the first prism sheet 11 may have a first surface M1 and a second surface M2 that are opposite each other. The first surface M1 may include a plurality of first dimming units 130 extending along a first direction D1 and arranged in an array. In some examples, the orthographic projection of the first prism sheet 11 on the second surface may be substantially rectangular. The first prism sheet 11 may also have two first side surfaces 11a and two third side surfaces 11b that connect the first surface M1 and the second surface M2. The two first side surfaces 11a may extend along a third direction X and be disposed opposite each other along a fourth direction Y. The two third side surfaces 11b may extend along the fourth direction Y and be disposed opposite each other along the third direction X. The first side surface 11a may connect an edge of the first surface M1 in the fourth direction Y and an edge of the second surface M2 on the same side in the fourth direction Y, and the third side surface 11b may connect an edge of the first surface M1 in the third direction X and an edge of the second surface M2 on the same side in the third direction X. For example, the two first side surfaces 11a and the two third side surfaces 11b may be perpendicular to the second surface M2. The third direction X may be perpendicular to the fourth direction Y. The plane containing the third direction X and the fourth direction Y may be a horizontal plane. The third direction X may be parallel to the horizontal line. The fifth direction Z may be perpendicular to the plane containing the third direction X and the fourth direction Y. The fifth direction Z may be the thickness direction of the first prism sheet 11 and the second prism sheet 12. The first direction D1 intersects both the third direction X and the fourth direction Y. The angle between the first direction D1 and the third direction X may be the first cutting angle a1 of the first prism sheet 11.

[0080] In some examples, as shown in Figures 3, 5, and 7, the second prism sheet 12 may have opposing third and fourth surfaces M3 and M4. The third surface M2 may include a plurality of second dimming units 140 extending along the second direction D2 and arranged in an array. In some examples, the orthographic projection of the second prism sheet 12 on the fourth surface may be substantially rectangular. The second prism sheet 12 may also have two second side surfaces 12a and two fourth side surfaces 12b connecting the third and fourth surfaces M3 and M4. The two second side surfaces 12a may both extend along the third direction X and be disposed opposite each other in the fourth direction Y. The two fourth side surfaces 12b may both extend along the fourth direction Y and be disposed opposite each other in the third direction X. The second side surface 12a may connect an edge of the third surface M3 in the fourth direction Y and an edge of the fourth surface M4 on the same side in the fourth direction Y, and the fourth side surface 12b may connect an edge of the third surface M3 in the third direction X and an edge of the fourth surface M4 on the same side in the third direction X. For example, the two third side surfaces 12a and the two fourth side surfaces 12b may both be perpendicular to the fourth surface M4. The angle between the second direction D2 and the third direction X may be a second cutting angle a2 of the second prism sheet 12. The first cutting angle a1 may be different from the second cutting angle a2, such that the first direction D1 intersects the second direction D2. For example, the absolute value of the second cutting angle a2 may be greater than the absolute value of the first cutting angle a1.

[0081] In some examples, the absolute value of the first cutting angle a1 and the second cutting angle a2 may be greater than or equal to 0 and less than 90 degrees. In some examples, the difference between the absolute value of the first cutting angle a1 and the absolute value of the second cutting angle a2 may range from 45 degrees to 75 degrees. In some examples, the absolute value of the first cutting angle a1 may be greater than or equal to 0 and less than or equal to 15 degrees. For example, the absolute value of the first cutting angle a1 may be greater than or equal to 3 degrees and less than or equal to 10 degrees. The absolute value of the second cutting angle a2 may be greater than or equal to 60 degrees and less than or equal to 75 degrees. For example, the absolute value of the second cutting angle a2 may be greater than or equal to 65 degrees and less than or equal to 70 degrees. The angle setting of the first cutting angle and the second cutting angle in this example can achieve a balance between viewing angle and brightness requirements.

[0082] In some examples, as shown in FIG4 , each first dimming unit 130 may include two first extension surfaces 131 and 132 extending along a first direction D1. On a side away from the second surface M2, the extension edges of the two first extension surfaces 131 and 132 intersect. Ends of the two first extension surfaces 131 and 132 away from the second surface M2 may intersect at a first intersection line 133. The extension direction of the first intersection line 133 may be parallel to the first direction D1.

[0083] In some examples, as shown in FIG4 , in a cross section perpendicular to the second plane M2 and perpendicular to the first direction D1, the cross-sectional shape of the first dimming portion 130 of the first prism sheet 11 can be triangular, for example, an isosceles triangle. The angle between the first extension surface 131 and the second plane M2 can be substantially the same as the angle between the first extension surface 132 and the second plane M2. The first extension surfaces 131 and 132 can be substantially symmetrical about the first intersection line 133.

[0084] In some examples, as shown in FIG4 , the angle b1 between the two first extension surfaces 131 and 132 is denoted by b1. b1 can be referred to as the vertex angle of the first dimming portion 130 . In some examples, the angle b1 between the two first extension surfaces 131 and 132 can be between 87 and 92 degrees, for example, 90 degrees. By setting the angle b1 between the two first extension surfaces 131 and 132 to approximately 90 degrees, optimal brightness can be achieved. In other examples, the connection between the two first extension surfaces 131 and 132 can be rounded.

[0085] In some examples, as shown in FIG5 , each second dimming unit 140 may include two second extension surfaces 141 and 142 extending along the second direction D2. On a side away from the fourth surface M4, the extension edges of the two second extension surfaces 141 and 142 intersect. Ends of the two second extension surfaces 141 and 142 away from the fourth surface M4 may intersect at a second intersection line 143. The extension direction of the second intersection line 143 may be parallel to the second direction D2.

[0086] In some examples, as shown in FIG5 , in a cross section perpendicular to the fourth plane M4 and perpendicular to the second direction D2, the cross-sectional shape of the second light modulating portion 140 of the second prism sheet 12 can be triangular, for example, an isosceles triangle. The angle between the second extension surface 141 and the fourth plane M4 can be substantially the same as the angle between the second extension surface 142 and the fourth plane M4. The second extension surfaces 141 and 142 can be substantially symmetrical about the second intersection line 143.

[0087] In some examples, as shown in FIG5 , the angle between the two second extension surfaces 141 and 142 is b2. b2 can be referred to as the vertex angle of the second dimming portion 140. For example, b2 can be equal to b1. In some examples, the angle b2 between the two second extension surfaces 141 and 142 can be 87 to 92 degrees, for example, 90 degrees. By setting the angle between the two second extension surfaces 141 and 142 to approximately 90 degrees, a better brightness can be achieved. In other examples, the connection between the two second extension surfaces 141 and 142 can form a rounded corner.

[0088] In some examples, the second surface M2 of the first prism sheet 11 and the fourth surface M4 of the second prism sheet 12 may be planes, or may be approximately plane surfaces, for example, approximately plane surfaces allowing for protrusions or depressions caused by a manufacturing process. The second surface M2 may be parallel to the fourth surface M4.

[0089] In some examples, as shown in FIG3 and FIG4 , the plurality of first dimming parts 130 of the first prism sheet 11 can be continuously distributed along a direction perpendicular to the first direction D1, for example, the ends of the first extension surfaces of two adjacent first dimming parts 130 are connected. In other examples, the plurality of first dimming parts 130 can be spaced apart along a direction perpendicular to the first direction D1, that is, the ends of the first extension surfaces of two adjacent first dimming parts 140 may not be connected. This embodiment is not limited to this.

[0090] In some examples, as shown in FIG3 and FIG5 , the plurality of second dimming parts 140 of the second prism sheet 12 can be continuously distributed along a direction perpendicular to the second direction D2, for example, the ends of the second extension surfaces of two adjacent second dimming parts 140 are connected. In other examples, the plurality of second dimming parts 140 can be spaced apart along a direction perpendicular to the second direction D2, that is, the ends of the second extension surfaces of two adjacent second dimming parts 140 may not be connected. This embodiment is not limited to this.

[0091] In some examples, as shown in FIG4 , the distance between the first intersection lines 133 of two adjacent first dimming sections 130 may be the first dimming period (Pitch) L1 of the first prism sheet. As shown in FIG4 , the distance between the second intersection lines 143 of two adjacent second dimming sections 140 may be the second dimming period L2 of the second prism sheet. The first dimming period L1 and the second dimming period L2 may be substantially the same. For example, the first dimming period L1 and the second dimming period L2 may range from 25 microns to 50 microns, for example, from 30 microns to 45 microns. By setting the dimming period to be greater than or equal to 25 microns, the sensitivity of the prism sheet to foreign matter can be ensured.

[0092] In some examples, as shown in FIG4 , the first prism sheet 11 may include: a first substrate 110, a first prism layer located on one side of the first substrate 110, and a first coating layer 111 located on a side of the first substrate 110 away from the first prism layer. The first prism layer may include a plurality of first light modulating units 130. The second surface M2 of the first prism sheet 11 may be a surface of the first coating layer 111 on a side away from the first substrate 110. The first coating layer 111 may be used to provide protection, increase wear resistance and scratch resistance, and prevent the first prism layer from being damaged.

[0093] In some examples, as shown in FIG5 , the second prism sheet 12 may include: a second substrate 120, a second prism layer located on one side of the second substrate 120, and a second coating layer 121 located on a side of the second substrate 120 away from the second prism layer, and the second prism layer may include a plurality of second light modulating units 140. The fourth surface M4 of the second prism sheet 12 may be a surface of the second coating layer 121 on a side away from the second substrate 120. The second coating layer 121 may be used to provide protection, increase wear resistance and scratch resistance, and prevent the second prism layer from being damaged.

[0094] In some examples, the first substrate 110 and the second substrate 120 can be made of polyethylene terephthalate (PET) material. PET material has good transparency and the greatest toughness among thermoplastic plastics, which can ensure the firm structure of the prism sheet. In addition, PET material has good electrical insulation performance and is less affected by temperature, which can ensure the stability of the optical performance of the prism sheet.

[0095] In some examples, the material of the first coating layer 111 and the second coating layer 121 can be a variety of resin polymers, such as polyethylene, polystyrene and other materials. The resin polymer has good transparency and can ensure the optical performance of the prism sheet. In this example, by setting the first coating layer and the second coating layer, the haze of the first prism sheet 11 and the second prism sheet 12 can be adjusted. Haze is the percentage of the transmitted light intensity that deviates from the incident light by more than 2.5° to the total transmitted light intensity. The greater the haze, the lower the gloss and transparency of the film, especially the imaging quality.

[0096] In some examples, the haze range of the first prism sheet can be 10% to 45%, for example, 15% to 30%. By setting the haze of the first prism sheet to be greater than or equal to 15%, the shielding property of the first prism sheet can be ensured, and by setting the haze of the first prism sheet to be less than or equal to 30%, a large brightness loss can be avoided. The haze range of the second prism sheet can be 10% to 45%, for example, 25% to 45%. By setting the haze of the second prism sheet to be greater than or equal to 25%, it can be ensured that the TCO viewing angle standard is met, and by setting the haze of the second prism sheet to be less than or equal to 45%, a large brightness loss can be avoided. For example, the haze of the first prism sheet can be 15%, and the haze of the second prism sheet can be 40%.

[0097] In some examples, the refractive index of the first dimming section 130 and the second dimming section 140 can be 1.45 to 1.7, for example, 1.52 to 1.61. In some examples, the first dimming section 130 and the second dimming section 140 can be made of the same material, and the refractive index of the first dimming section 130 and the second dimming section 140 can be the same. In other examples, the refractive index of the first dimming section 130 and the second dimming section 140 can be different. This embodiment is not limited to this. By setting the refractive index of the dimming section to be less than or equal to 1.61, the scratch resistance of the prism sheet can be ensured.

[0098] In some examples, the viewing angle is one of the important specifications of the display device, and the TCO international standard has clear requirements for the viewing angle. The viewing angle may include a horizontal viewing angle (Horizontal Viewing Angle) and a vertical viewing angle (Vertical Viewing Angle). The horizontal viewing angle refers to the angle range that can be observed from the left to the right side of the display screen in the horizontal direction. The horizontal viewing angle may indicate the width range of the content that the user can see on the screen when using the display normally. The vertical viewing angle refers to the angle range that can be observed from the top to the bottom of the display screen in the vertical direction. The vertical viewing angle may indicate the height range of the content that the user can see on the screen when using the display normally.

[0099] Figure 8A is a schematic diagram of the display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure. Figure 8B is an observation diagram of the liquid crystal panel shown in Figure 8A when measuring horizontal viewing angle. Figure 8C is an observation diagram of the liquid crystal panel shown in Figure 8A when measuring vertical viewing angle.

[0100] In some examples, as shown in Figures 8A to 8C, the LCD panel 20 may have a rectangular display area 200. In this example, the camera 30 is used to measure the viewing angle. The viewing distance between the camera 30 and the LCD panel 20 (i.e., the vertical distance between the camera 30 and the LCD panel 20) can be a conventional observation distance, such as approximately 1 meter.

[0101] In some examples, as shown in FIG. 8A , the display area 200 may have a first position P L , second position P R , the third position P T , fourth position P B and the center position P C . First position P L and the second position P R Can be located at the center position P along the third direction X C On both sides, that is, the left and right sides, the first position P L and the second position P R It may be located on the center line of the display area 200 in the fourth direction Y. The third position PT and the fourth position P B It can be located at the center position P along the fourth direction Y C On both sides, namely the upper and lower sides, the third position P T and the fourth position P B It may be located on the center line of the display area 200 in the third direction X.

[0102] In some examples, the length of the display area 200 along the third direction X may be W, and the first position P may be L The distance between the second position P and a boundary (eg, the left boundary) of the display area 200 along the third direction X is W1. R The distance from another boundary of the display area 200 along the third direction (eg, the right boundary) may be W2. W1 may be equal to W2, for example, both are W / 10.

[0103] In some examples, the length of the display area 200 along the fourth direction Y may be H, and the third position P may be T The distance between the fourth position P and a boundary (eg, upper boundary) of the display area 200 along the fourth direction Y may be H1. B The distance between the display area 200 and another boundary (eg, the lower boundary) along the fourth direction Y may be H2. H1 may be equal to H2, for example, both are H / 10.

[0104] In some examples, when the camera 30 is used to view the liquid crystal panel 20, the frequency and range of left and right movement are generally greater than the frequency and range of up and down movement. Therefore, the horizontal viewing angle of the liquid crystal panel 20 should be as large as possible. When the camera 30 moves left or right, the angle θ1 between the line of sight and the central axis of the display area 200 is 30 degrees. If the two positions of the display area 200 that are viewed along the third direction X (i.e., the first position P L and the second position P R ) is greater than a preset value, it is considered that the viewing angle of the liquid crystal panel 20 along the horizontal direction is small and does not meet the horizontal viewing angle requirement. When the camera 30 moves upward or downward, the angle θ2 between the line of sight and the central axis of the display area 200 is 15 degrees. If the two positions of the display area 200 that are viewed along the fourth direction Y (i.e., the third position P T and the fourth position P B ) is greater than a preset value, it is considered that the viewing angle of the liquid crystal panel 20 along the vertical direction is small and does not meet the vertical viewing angle requirement. In some examples, the preset value may be 1.73, for example.

[0105] In some examples, the TCO horizontal viewing angle uniformity A can be calculated as follows 水平 , and the first TCO vertical viewing angle uniformity A垂直1 And the second TCO vertical viewing angle uniformity A 垂直2 .

[0106] Among them, L max+30° It represents the maximum brightness value obtained when the observation angle θ1 is 30 degrees. min+30° Indicates the minimum brightness value obtained when the observation angle θ1 is 30 degrees. max-30° Indicates the maximum brightness value obtained when the observation angle θ1 is -30 degrees, L min-30° Indicates the minimum brightness value obtained when the observation angle θ1 is -30 degrees. max+15° It represents the maximum brightness value obtained when the observation angle θ2 is 15 degrees. min+15° Indicates the minimum brightness value obtained when the observation angle θ2 is 15 degrees. max-15° Indicates the maximum brightness value obtained when the observation angle θ2 is -15 degrees, L min-15° Indicates the minimum brightness value obtained when the observation angle θ2 is -15 degrees.

[0107] In some examples, the first TCO vertical viewing angle uniformity A may be selected to be 垂直1 And the second TCO vertical viewing angle uniformity A 垂直2 The larger one is used as the TCO vertical viewing angle uniformity.

[0108] Based on the testing principle of TCO horizontal and vertical viewing angles, in order to facilitate simulation, the calculation of the TCO viewing angle uniformity can be converted into the brightness ratio of the center point at different viewing angles.

[0109] In some examples, the horizontal viewing angles ∠A and ∠B can be calculated using the following formulas:

[0110] In some examples, the vertical viewing angles ∠E and ∠F can be calculated using the following equations:

[0111] Wherein, D represents the diagonal size of the liquid crystal panel, H is the length of the liquid crystal panel in the fourth direction Y, and W is the length of the liquid crystal panel in the third direction X.

[0112] Based on the above formula, the horizontal and vertical viewing angles required for brightness testing can be calculated for LCD panels of different sizes. The TCO viewing angle uniformity is then calculated based on the brightness at these horizontal and vertical viewing angles to determine whether the TCO viewing angle requirements are met.

[0113] In some examples, the TCO viewing angle uniformity (including the TCO horizontal viewing angle uniformity A) of the corresponding liquid crystal panel can be calculated according to the following formula: 水平 , and the first TCO vertical viewing angle uniformity A 垂直1 And the second TCO vertical viewing angle uniformity A 垂直2 ).

[0114] The effect of DBEF on the output light of the dimming component is described below.

[0115] Figure 9A is a full-viewing angle distribution diagram of a backlight module based on a DPP architecture. Figure 9B is a full-viewing angle distribution diagram of a backlight module based on a DBEF+DPP architecture. The dimming component of the backlight module corresponding to Figure 9A includes: a stacked diffuser, a second prism sheet, and a first prism sheet. The stacked structure can be called a DPP (Diffuer+Prism+Prism) structure. Among them, the first cutting angle of the first prism sheet is 0 degrees, and the second cutting angle of the second prism sheet is 90 degrees. The dimming component of the backlight module corresponding to Figure 9B includes: a stacked diffuser, a second prism sheet, a first prism sheet, and a DBEF. The stacked structure can be called a DPP structure combined with DBEF (i.e., a DBEF+DPP architecture). Among them, the first cutting angle of the first prism sheet is 0 degrees, and the second cutting angle of the second prism sheet is 90 degrees.

[0116] Figure 10 compares the brightness curves of a backlight module based on the DPP architecture and a backlight module based on the DBEF+DPP architecture. The abscissa in Figure 10 represents horizontal viewing angle, and the ordinate represents brightness in nits. Curve K11 in Figure 10 shows the brightness curve for the backlight module based on the DPP architecture; curve K12 shows the brightness curve for the backlight module based on the DBEF+DPP architecture.

[0117] As shown in Figures 9A, 9B, and 10, after applying DBEF, the brightness differences between different viewing angles are reduced, and the brightness curve at horizontal viewing angles becomes smoother. The brightness peak at a horizontal viewing angle of approximately 50 degrees disappears, improving the horizontal viewing angle uniformity of the TCO.

[0118] Figure 11 is a schematic diagram of testing polarized light intensity. In some examples, a polarizer (POL) is placed on the light-emitting side of a DPP-based backlight module. The polarizer is rotated and the brightness of the center point at a normal viewing angle (i.e., 0 degrees) is measured to determine the polarized light intensity of the backlight module at different prism cut angles.

[0119] Figure 12A shows the brightness curve of a backlight module based on the DPP architecture as the polarizer rotates. Figure 12B shows the brightness curve of a backlight module based on the DBEF+DPP architecture as the polarizer rotates. In Figures 12A and 12B, the horizontal axis represents the rotation angle of the polarizer, and the vertical axis represents the brightness in nits.

[0120] In FIG12A , curve K21 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet and the second prism sheet are both 0 degrees. Curve K22 represents a brightness curve of a backlight module in which the cutting angle of the first prism sheet is 15 degrees and the cutting angle of the second prism sheet is 0 degrees. Curve K23 represents a brightness curve of a backlight module in which the cutting angle of the first prism sheet is 45 degrees and the cutting angle of the second prism sheet is 0 degrees. Curve K24 represents a brightness curve of a backlight module in which the cutting angle of the first prism sheet is 60 degrees and the cutting angle of the second prism sheet is 0 degrees. Curve K25 represents a brightness curve of a backlight module in which the cutting angle of the first prism sheet is 90 degrees and the cutting angle of the second prism sheet is 0 degrees.

[0121] In FIG12B , curve K31 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet and the second prism sheet are both 0 degrees. Curve K32 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet are 0 degrees and the cutting angles of the second prism sheet are 15 degrees. Curve K33 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet are 0 degrees and the cutting angles of the second prism sheet are 45 degrees. Curve K34 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet are 0 degrees and the cutting angles of the second prism sheet are 60 degrees. Curve K35 represents a brightness curve of a backlight module in which the cutting angles of the first prism sheet are 0 degrees and the cutting angles of the second prism sheet are 90 degrees.

[0122] As the angle of the polarizer changes, the brightness of the outgoing light changes periodically, in accordance with Malus's law: I = I0 + I1cos(θ-β) 2

[0123] Among them, I represents the brightness of the output light, I0 represents natural light, which is half the brightness of natural light; I1 represents the brightness of linearly polarized light; θ is the angle of the polarizer; β is the peak phase, β = Up Prism + 95°, and Up Prism represents the cutting angle of the first prism.

[0124] By comparing Figures 12A and 12B, it can be seen that in the backlight module without DBEF, the brightness peak continuously shifts in phase as the cutting angle of the first prism sheet changes. After DBEF is installed in the backlight module, regardless of how the included angle between the first and second prism sheets (i.e., the difference between the cutting angles of the first and second prism sheets) changes, the brightness peak remains fixed at 0 degrees, 90 degrees, and 180 degrees. This shows that DBEF completely changes the polarization form of the output light, transforming partially polarized light with natural light as the main component into partially polarized light with linear polarization as the main component.

[0125] Based on the above analysis, DBEF is generally beneficial for improving viewing angles. By analyzing and determining the impact of various parameters of the two prisms under DBEF on brightness and viewing angle, the best combination can be selected to achieve compatible viewing angle and brightness requirements.

[0126] The following analysis illustrates the impact of the prism sheet's individual parameters on the TCO viewing angle and brightness of the backlight module.

[0127] In some examples, simulation tests show that the higher the refractive index of the prism sheet's dimming portion, the better the brightening effect. Taking into account reliability factors such as scratch resistance during actual product use, the dimming portions of the first and second prism sheets can be made of materials with a refractive index range of 1.45 to 1.7. This refractive index selection range not only ensures reliability but also eliminates the need for protective films during actual transportation, minimizing film costs.

[0128] In some examples, based on actual product specifications and practical production feasibility, the first dimming period of the first prism sheet and the second dimming period of the second prism sheet can be selected to be in the range of 25 microns to 50 microns, for example, 30 microns to 45 microns. This dimming period selection range can avoid the situation where sensitivity to foreign matter is reduced.

[0129] Figure 13A is a full-viewing distribution diagram of the haze variation of the first prism sheet of a backlight module based on the DPP architecture. Figure 13B is a full-viewing distribution diagram of the haze variation of the first prism sheet of a backlight module based on the DBEF+DPP architecture. Figure 14A is a full-viewing distribution diagram of the haze variation of the second prism sheet of a backlight module based on the DPP architecture. Figure 14B is a full-viewing distribution diagram of the haze variation of the second prism sheet of a backlight module based on the DBEF+DPP architecture.

[0130] In some examples, as shown in Figures 13A to 14B, by comparing the full viewing angle distribution diagrams under different haze levels of prism sheets, it can be seen that changing the haze of the first prism sheet and changing the haze of the second prism sheet have different effects. Changing the haze of the first prism sheet can compress the brightness distribution within the entire viewing angle, transforming high-brightness areas into low-brightness areas, making the entire viewing angle softer, and having less impact on the TCO viewing angle uniformity. Changing the haze of the second prism sheet can shift the central brightness to around 40 degrees (this angle can be controlled by the angle between the first prism sheet and the second prism sheet), which has a greater impact on the TCO viewing angle uniformity.

[0131] By comparing actual test data, a haze of 15% for the first prism sheet and 40% for the second prism sheet was chosen to achieve a balance between viewing angle and brightness. In other examples, when the TCO viewing angle uniformity requirements of the LCD panel become lower, the haze of the second prism sheet can be appropriately reduced to achieve greater brightness gain.

[0132] In some examples, the angle between the first prism sheet and the second prism sheet (i.e., the angle between the first direction in which the first dimming portion of the first prism sheet extends and the second direction in which the second dimming portion of the second prism sheet extends) is a key parameter affecting brightness and viewing angle performance. Because DBEF is sensitive to the polarization state of the incident light, more light passes through the DBEF when the principal polarization direction of the incident light is parallel to the DBEF transmission direction.

[0133] Figure 15 is a schematic diagram of the outgoing light of the first prism sheet. In some examples, there are multiple refractions and reflections between the first dimming portion of the first prism sheet and the air, resulting in certain polarization characteristics in the outgoing light. As shown in Figure 15, the P wave and S wave in the incident light incident on the first extension surface 131 of the first dimming portion can be roughly the same. After reflection on the first extension surface 131, the P wave of the reflected light is smaller than the S wave. The reflected wave is reflected again on the first extension surface 132 and enters the air through refraction. The P wave of the reflected wave on the second extension surface 132 is smaller than the S wave. The P wave of the refracted light on the first extension surface 132 is larger than the S wave. It can be seen that the main polarization direction of the outgoing light of the first prism sheet is perpendicular to the extension direction of the first dimming portion.

[0134] FIG16 is a schematic diagram of the main polarization direction of the outgoing light. In some examples, a polarizer is provided on the light-emitting side of the backlight module of the DPP architecture, and the brightness change of the outgoing light is detected by rotating the polarizer. Experiments have shown that there is always a 5-degree phase difference in the highest linear polarization intensity relative to the cutting angle of the first prism. As shown in FIG16 , the main polarization direction of the outgoing light is 95 degrees. The inclined horizontal axis in FIG16 represents the natural light portion of the outgoing light, and the inclined vertical axis represents the polarized light portion of the outgoing light. The horizontal horizontal axis can represent a horizontal line.

[0135] Based on the above analysis, it can be seen that the absolute value range of the cutting angle of the first prism sheet can be 0 degrees to 15 degrees to achieve further brightness gain. For example, the absolute value range of the cutting angle of the first prism sheet can be 3 degrees to 10 degrees. Through testing and research, it was found that when the cutting angle of the first prism sheet is 15 degrees and the cutting angle of the second prism sheet is 90 degrees, the brightness gain of the backlight module is the largest but the TCO viewing angle uniformity is the worst; when the cutting angle of the first prism sheet is 5 degrees and the cutting angle of the second prism sheet is 40 degrees, the TCO viewing angle uniformity of the backlight module is the best but the brightness is the lowest. Through comparative analysis of matching products, it can be seen that the absolute value range of the cutting angle of the second prism sheet can be 60 degrees to 75 degrees. For example, the absolute value range of the cutting angle of the second prism sheet can be 65 degrees to 70 degrees. The angle range of the second prism sheet in this example can avoid severe brightness loss below 60 degrees and avoid failure to meet the TCO viewing angle requirements above 75 degrees.

[0136] In some examples, multiple control structures are used for comparison with the structure of the dimming component of this example. The dimming component of this example may include a stacked diffuser, a second prism sheet, a first prism sheet, and a DBEF, wherein the cutting angle of the first prism sheet may be 5 degrees, and the cutting angle of the second prism sheet may be 75 degrees. The dimming component of the control structure one may adopt a DP+DBEF architecture, and may include: a stacked diffuser, a prism sheet, and a DBEF, wherein the angle between the two extended surfaces of the dimming portion of the prism sheet may be 90 degrees, and the connection position of the two extended surfaces does not form a rounded corner. The dimming component of the control structure two may adopt a DP+DBEF architecture, and may include: a stacked diffuser, a prism sheet, and a DBEF, wherein the angle between the two extended surfaces of the dimming portion of the prism sheet may be 90 degrees, and the connection position of the two extended surfaces forms a rounded corner. The dimming component of the control structure three may adopt a DDP+DBEF architecture, and may include: a stacked first diffuser, a second diffuser, a prism sheet, and a DBEF.

[0137] Test results show that compared to control structure 1, the dimming component of this example achieves a brightness increase of approximately 3.94%; compared to control structure 2, the dimming component of this example achieves a brightness increase of approximately 2.43%; and compared to control structure 3, the dimming component of this example achieves a brightness gain of approximately 8.76%. This indicates that compared to a dimming component using a single prism and DBEF architecture, the dimming component of this example can achieve a brightness gain of 2% to 8%. This dimming component of this example can achieve a brightness increase while meeting TCO viewing angle requirements.

[0138] Figure 17 is a schematic diagram of a display device according to at least one embodiment of the present disclosure. In some examples, as shown in Figure 17, the display device may include: a backlight module 40 and a liquid crystal panel 20 located on the light-emitting side of the backlight module 40. The backlight module 40 may include: a light source module 30 and a dimming component 10. The dimming component 10 may be located between the liquid crystal panel 20 and the light source component 30. The structure of the dimming component 10 may be as described in the aforementioned embodiment. The light source component 30 is configured to generate light directed toward the dimming component 10. The outgoing light of the light source component 30 may sequentially pass through the second prism sheet and the first prism sheet of the dimming component 10 and be directed toward the liquid crystal panel 20. In some examples, the light source component may adopt a back-entry light source or a side-entry light source. This embodiment is not limited to this. The backlight module and display device of this example have the advantages of small thickness, high gain and wide viewing angle.

[0139] In some examples, as shown in FIG17 , the liquid crystal panel 20 may primarily include an array substrate, a cell substrate, and a liquid crystal layer located between the array substrate and the cell substrate. The liquid crystal panel 20 may be of a VA type, an IPS type, a TN type, or the like. This embodiment is not limited thereto.

[0140] In some examples, the display device can be a mobile device, such as a smartphone, tablet computer, laptop computer, etc., the display device can be a wearable terminal, such as a smart watch, smart bracelet, smart glasses, augmented reality device, etc., and the display device can be a fixed terminal, such as a desktop computer, TV, etc.

[0141] The drawings in this disclosure only relate to the structures involved in this disclosure, and other structures can refer to the general design. In the absence of conflict, the embodiments of the present disclosure, that is, the features in the embodiments, can be combined with each other to obtain new embodiments. It should be noted that the above-mentioned embodiments or implementation methods are merely exemplary and not restrictive. Therefore, the present disclosure is not limited to the contents shown and described in detail herein. Various modifications, replacements or omissions can be made to the forms and details of the implementation without departing from the scope of this disclosure.

Claims

1. A dimming component, comprising: A first prism sheet and a second prism sheet arranged opposite to each other; The first prism sheet has a first surface and a second surface opposite to each other, and the first surface includes: a plurality of first dimming parts extending along a first direction and arranged in an array; The second prism sheet has a third surface and a fourth surface opposite to each other, the third surface is located on a side of the second prism sheet close to the first prism sheet, and the third surface includes: a plurality of second dimming parts extending along a second direction and arranged in an array; an auxiliary film, located on a side of the first prism sheet away from the second prism sheet; The first prism sheet further comprises at least one first side surface extending along a third direction and connecting the first surface and the second surface; the second prism sheet further comprises at least one second side surface extending along the third direction and connecting the third surface and the fourth surface; the angle between the third direction and the first direction is the first cutting angle of the first prism sheet, and the angle between the third direction and the second direction is the second cutting angle of the second prism sheet; An absolute value of a second cutting angle of the second prism sheet is greater than an absolute value of a first cutting angle of the first prism sheet, and absolute values ​​of the first cutting angle and the second cutting angle are greater than or equal to 0 and less than 90 degrees.

2. The dimming component according to claim 1, wherein: An absolute value of the first cutting angle is greater than or equal to 0 and less than or equal to 15 degrees.

3. The dimming component according to claim 2, wherein: An absolute value of the first cutting angle is greater than or equal to 3 degrees and less than or equal to 10 degrees.

4. The dimming component according to claim 2, wherein: The difference between the absolute value of the first cutting angle and the absolute value of the second cutting angle ranges from 45 degrees to 75 degrees.

5. The dimming component according to claim 4, wherein: An absolute value of the second cutting angle is greater than or equal to 60 degrees and less than or equal to 75 degrees.

6. The dimming component according to claim 5, wherein: An absolute value of the second cutting angle is greater than or equal to 65 degrees and less than or equal to 70 degrees.

7. The dimming component according to claim 1, wherein: The first cutting angle is 5 degrees, and the second cutting angle is 75 degrees.

8. The dimming component according to any one of claims 1 to 7, wherein: The haze of the first prism sheet and the haze of the second prism sheet are both in a range of 10% to 45%, and the haze of the first prism sheet is smaller than the haze of the second prism sheet.

9. The dimming component according to claim 8, wherein: The haze of the first prism sheet ranges from 15% to 30%, and the haze of the second prism sheet ranges from 25% to 45%.

10. The dimming component according to claim 9, wherein: The haze of the first prism sheet is 15%, and the haze of the second prism sheet is 40%.

11. The dimming component according to any one of claims 1 to 10, wherein: The first dimming portion of the first prism sheet has two first extension surfaces extending along the first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, ends of the two first extension surfaces away from the second surface intersect to form a first intersection line; the distance between adjacent first intersection lines is a first dimming period; The second dimming portion of the second prism sheet has two second extension surfaces extending along the second direction, and in a cross section perpendicular to the fourth surface and perpendicular to the second direction, the two second extension surfaces are away from the fourth surface. The ends intersect to form a second intersection line, and the distance between adjacent second intersection lines is a second dimming period; The first dimming period and the second dimming period are in a range of 25 microns to 50 microns.

12. The dimming component according to claim 11, wherein: The first dimming period and the second dimming period are in a range of 30 microns to 45 microns.

13. The dimming component according to any one of claims 1 to 12, wherein: The first dimming portion of the first prism sheet has two first extension surfaces extending along the first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, the angle between the two first extension surfaces ranges from 87 degrees to 92 degrees; the second dimming portion of the second prism sheet has two second extension surfaces extending along the second direction, and in a cross section perpendicular to the fourth surface and perpendicular to the second direction, the angle between the two second extension surfaces ranges from 87 degrees to 92 degrees.

14. The dimming component according to any one of claims 1 to 13, wherein: The refractive index of the first light modulating part of the first prism sheet and the second light modulating part of the second prism sheet ranges from 1.45 to 1.

7.

15. The dimming component according to claim 14, wherein: The refractive index of the first light modulating part of the first prism sheet and the second light modulating part of the second prism sheet ranges from 1.52 to 1.

61.

16. The dimming component according to any one of claims 1 to 15, further comprising: A diffusion sheet is located on a side of the second prism sheet away from the first prism sheet, and is configured to diffuse the transmitted light and direct the diffused light toward the second prism sheet. 17 . A backlight module, comprising a light source assembly and a dimming assembly as claimed in claim 1 , wherein the light source assembly is configured to generate light directed toward the dimming assembly.

18. A display device comprising the backlight module according to claim 17 and a liquid crystal panel located on the light emitting side of the backlight module.

Images