Dimming assembly, backlight module, and display device

Abstract

A dimming assembly, 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 comprises multiple first dimming portions which extend in a first direction and are arranged in an array. The first prism sheet further has at least one first side surface which extends in a third direction and is connected to the first surface and the second surface, and the included angle between the third direction and the first direction is a first cutting angle of the first prism sheet. The absolute value of the first cutting angle is greater than or equal to 20 degrees and less than or equal to 40 degrees. The second prism sheet has a third surface and a fourth surface opposite to each other. The third surface is located on the side of the second prism sheet close to the first prism sheet. The third surface comprises multiple second dimming portions which extend in a second direction and are arranged in an array. The included angle between the first direction and the second direction is greater than 0 degree and less than 90 degrees.

Description

Dimming component, backlight module and display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 28, 2023, with application number 202310945749.2 and invention name “Dimming component, backlight module and display device”, the content of which should be understood as incorporated into this application by reference. Technical Field

[0002] 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

[0003] 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. In particular, the High-Dynamic Range (HDR) standard that has emerged in recent years can provide higher brightness, better contrast, color accuracy, and more vivid colors compared to the Standard Dynamic Range (SDR). However, LCD manufacturers face many technical difficulties in achieving the HDR standard. Among them, sacrificing the module viewing angle to achieve high brightness is one of the common technical difficulties in the industry.

[0004] Summary of the Invention

[0005] 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.

[0006] Embodiments of the present disclosure provide a dimming component, a backlight module, and a display device.

[0007] On the one hand, this embodiment provides a dimming component, including: 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 relative 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 first prism sheet also has at least one first side surface extending along a third direction and connecting the first surface and the second surface. The angle between the third direction and the first direction is the first cutting angle of the first prism sheet. The absolute value of the first cutting angle is greater than or equal to 20 degrees and less than or equal to 40 degrees. The second prism sheet has a third surface and a fourth surface relative to each other. The third surface is located on the side of the second prism sheet close to the first prism sheet. The third surface includes a plurality of second dimming parts extending along a second direction and arranged in an array. The angle between the first direction and the second direction is greater than 0 and less than 90 degrees.

[0008] In some exemplary embodiments, an absolute value of the first cutting angle is greater than or equal to 25 degrees and less than or equal to 33 degrees.

[0009] In some exemplary embodiments, the angle between the first direction and the second direction ranges from 65 degrees to 75 degrees.

[0010] In some exemplary embodiments, the second prism sheet has at least one second side surface extending along the third direction and connecting the third surface and the fourth surface, and the angle between the third direction and the second direction is a second cutting angle of the second prism sheet; the absolute value of the second cutting angle is greater than the absolute value of the first cutting angle.

[0011] In some exemplary embodiments, a difference between an absolute value of the second cutting angle and an absolute value of the first cutting angle ranges from 10 degrees to 70 degrees.

[0012] In some exemplary embodiments, an absolute value of the second cutting angle is greater than or equal to 50 degrees and less than or equal to 90 degrees.

[0013] 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 80 degrees.

[0014] 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.

[0015] 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 1.5 to 1.6.

[0016] In some exemplary embodiments, the haze of the first prism sheet and the second prism sheet ranges from 10% to 45%.

[0017] In some exemplary embodiments, an absolute value of a difference in haze between the first prism sheet and the second prism sheet ranges from 5% to 30%.

[0018] In some exemplary embodiments, the first dimming portion of the first prism sheet has 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, an angle between the two first extension surfaces ranges from 87 degrees to 92 degrees.

[0019] In some exemplary embodiments, 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, an angle between the two second extension surfaces ranges from 87 degrees to 92 degrees.

[0020] 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.

[0021] In some exemplary embodiments, the dimming component further includes a reflective polarized brightness enhancement film, and the reflective polarized brightness enhancement film is located on a side of the first prism sheet away from 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 full-viewing angle distribution diagram of a backlight module using two prism sheets with perpendicular prism angles;

[0028] FIG2 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0029] FIG3 is a schematic cross-sectional view of a first prism sheet according to at least one embodiment of the present disclosure;

[0030] FIG4 is a schematic cross-sectional view of a second prism sheet according to at least one embodiment of the present disclosure;

[0031] FIG5 is a schematic top view of a first prism sheet according to at least one embodiment of the present disclosure;

[0032] FIG6 is a schematic top view of a second prism sheet according to at least one embodiment of the present disclosure;

[0033] FIG7A is a schematic diagram of a display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure;

[0034] FIG7B is an observation diagram of the liquid crystal panel shown in FIG7A when measuring the horizontal viewing angle;

[0035] FIG7C is an observation diagram of the liquid crystal panel shown in FIG7A when measuring a vertical viewing angle;

[0036] FIG8 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0037] FIG9 is a schematic diagram showing the effect of the refractive index of the light-adjusting portion of the prism sheet on the viewing angle;

[0038] FIG10 is a schematic diagram showing the effect of the haze of a prism sheet on the viewing angle;

[0039] FIG11 is a graph showing the effect of haze on viewing angle of a prism sheet;

[0040] FIG12 is a diagram showing the brightness distribution at all viewing angles after the first prism sheet and the second prism sheet of the dimming assembly rotate simultaneously;

[0041] FIG13 is a full-viewing angle distribution diagram of brightness after the second prism sheet of the dimming assembly is fixed and the first prism sheet is rotated;

[0042] FIG14 is a full-viewing angle distribution diagram of brightness after the first prism sheet of the dimming assembly is fixed and the second prism sheet is rotated;

[0043] FIG15A is a graph showing a change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated clockwise;

[0044] FIG15B is a graph showing a change in the TCO vertical viewing angle uniformity after the second prism sheet is rotated clockwise;

[0045] FIG16A is a graph showing a change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated counterclockwise;

[0046] FIG16B is a graph showing a change in the TCO vertical viewing angle uniformity after the second prism sheet is rotated counterclockwise;

[0047] FIG17A is a graph showing how the TCO viewing angle uniformity changes with the rotation angle of the second prism sheet;

[0048] FIG17B is a graph showing a change in brightness as the angle between the first prism sheet and the second prism sheet changes;

[0049] FIG18 is a diagram showing the brightness distribution at all viewing angles, which is influenced by the angle between the first prism sheet and the second prism sheet and the refractive indices of the first dimming unit and the second dimming unit;

[0050] FIG19 is another schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0051] FIG. 20 is a schematic diagram of a display device according to at least one embodiment of the present disclosure.

[0052] Details

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted 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 specific circumstances.

[0058] 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°.

[0059] 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.

[0060] 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.

[0061] In some implementations, a liquid crystal display device primarily includes a backlight module and a liquid crystal panel disposed on the light-emitting side of the backlight module. The backlight module can provide a surface light source to the liquid crystal panel, enabling the liquid crystal panel to display images properly. The backlight module primarily includes a light source assembly and a dimming assembly disposed on the light-emitting side of the light source assembly. During display, light emitted by the light source assembly passes through the dimming assembly and is directed toward the liquid crystal panel, enabling the liquid crystal panel to display images properly. The dimming assembly typically utilizes an optical film prism sheet, which utilizes optical refraction to enhance brightness at a central viewing angle. For example, the dimming assembly can utilize two prism sheets stacked at perpendicular angles (e.g., an upper prism sheet with a cutting angle of 0 degrees and a lower prism sheet with a cutting angle of 90 degrees). This converges light from both horizontal and vertical directions to a normal viewing angle (i.e., a 0-degree viewing angle), thereby enhancing the display brightness at a normal viewing angle and enabling the liquid crystal display device to achieve a higher brightness gain. Figure 1 illustrates the full viewing angle distribution of a backlight module utilizing two prism sheets at perpendicular angles. 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. As shown in Figure 1, the brightness at a large viewing angle drops significantly, and there is a problem that both the horizontal and vertical viewing angles cannot reach a good state. Due to the effect of the prism, while improving the brightness at the positive viewing angle, it will seriously affect the viewing angle distribution, making the viewing angle and brightness of the backlight module mutually restricted, and it is impossible to take into account the viewing angle and brightness requirements at the same time, and it is impossible to meet the requirements of the Swedish Labor Confederation (TCO, The TCO standard is a display certification standard promoted by the Swedish Labor Confederation and is currently one of the most widely recognized certifications in the display industry.

[0062] 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 obtain better brightness gain while meeting the TCO viewing angle requirements.

[0063] This embodiment provides a dimming component, including: 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 relative 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 first prism sheet has at least one first edge extending along a third direction, and the angle between the third direction and the first direction is the first cutting angle of the first prism sheet. The absolute value of the first cutting angle is greater than or equal to 20 degrees and less than or equal to 40 degrees. The second prism sheet has a third surface and a fourth surface relative to each other. The third surface is located on the side of the second prism sheet close to the first prism sheet. The third surface includes a plurality of second dimming parts extending along a second direction and arranged in an array. The angle between the first direction and the second direction is greater than 0 and less than 90 degrees.

[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 better brightness gain 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 angle range of the angle between the extension direction of the first dimming portion of the first prism sheet (i.e., the first direction) and the extension direction of the second dimming portion of the second prism sheet (i.e., the second direction), 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 25 degrees and less than or equal to 33 degrees. In this example, by setting the angle range of the first cutting angle, it is possible to facilitate achieving the TCO horizontal viewing angle requirement.

[0067] In some exemplary embodiments, the angle between the first direction and the second direction may be in the range of 65 to 75 degrees, such as approximately 70 degrees. In this example, by setting the angle between the first direction and the second direction, it is advantageous to achieve both brightness and viewing angle requirements.

[0068] In some exemplary embodiments, the second prism sheet has at least one second edge extending along a third direction, 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 may be greater than the absolute value of the first cutting angle. In some examples, the difference between the absolute value of the second cutting angle and the absolute value of the first cutting angle may range from 10 degrees to 70 degrees. In some examples, the absolute value of the second cutting angle may be greater than or equal to 50 degrees and less than or equal to 90 degrees. For example, the absolute value of the second cutting angle may be greater than or equal to 65 degrees and less than or equal to 80 degrees. By setting the absolute value of the second cutting angle to be greater than or equal to 65 degrees, the situation of severe brightness loss can be improved, and by setting the absolute value of the second cutting angle to be less than or equal to 80 degrees, the situation of failing to meet the TCO viewing angle requirements can be avoided.

[0069] In some exemplary embodiments, the refractive index of the first dimming portion of the first prism sheet and the second dimming portion of the second prism sheet may range from 1.45 to 1.7, that is, the refractive index of the first dimming portion of the first prism sheet and the second dimming portion of the second prism sheet may be greater than or equal to 1.45 and less than or equal to 1.7. In some examples, the refractive index of the first dimming portion of the first prism sheet and the second dimming portion of the second prism sheet may range from 1.5 to 1.6, that is, the refractive index of the first dimming portion of the first prism sheet and the second dimming portion of the second prism sheet may be greater than or equal to 1.5 and less than or equal to 1.6. By increasing the refractive index of the dimming portion, it is beneficial to improve the brightness and TCO viewing angle uniformity. Moreover, when the refractive index of the material used for the dimming portion is greater than 1.6, the scratch resistance decreases significantly. By setting the refractive index to be greater than 1.6, it is beneficial to improve the scratch resistance of the prism sheet.

[0070] In some exemplary embodiments, the haze of the first prism sheet and the haze of the second prism sheet may be the same or different. In some examples, the haze of the first prism sheet and the second prism sheet may range from 10% to 45% (i.e., greater than or equal to 10% and less than or equal to 45%). In some examples, the absolute value of the difference between the haze of the first prism sheet and the second prism sheet may range from 5% to 30%. 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%). When the haze of the first prism sheet is less than 15%, the shielding performance is poor. When the haze of the first prism sheet is greater than 30%, the brightness loss is significant. When the haze of the second prism sheet is less than 25%, the TCO viewing angle requirements cannot be met. When the haze of the second prism sheet is greater than 45%, the brightness loss is significant. The haze range of the first prism sheet and the second prism sheet in this example can be beneficial for achieving compatible brightness and viewing angle requirements.

[0071] 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 of the first prism sheet and perpendicular to the first direction, the angle between the two first extension surfaces may range from 87 degrees to 92 degrees, for example, the angle between the two first extension surfaces may be approximately 90 degrees. 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 of the second prism sheet and perpendicular to the second direction, the angle between the two second extension surfaces may range from 87 degrees to 92 degrees, for example, the angle between the two second extension surfaces may be approximately 90 degrees. This example can facilitate achieving higher brightness by setting the angle range of the two first extension surfaces of the first dimming portion and the angle range of the two second extension surfaces of the second dimming portion.

[0072] The solution of this embodiment is illustrated below through some examples.

[0073] Figure 2 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure. Figure 3 is a schematic cross-sectional diagram of a first prism sheet according to at least one embodiment of the present disclosure. Figure 4 is a schematic cross-sectional diagram of a second prism sheet according to at least one embodiment of the present disclosure. Figure 5 is a schematic top view of a first prism sheet according to at least one embodiment of the present disclosure. Figure 6 is a schematic top view of a second prism sheet according to at least one embodiment of the present disclosure. Figure 3 shows a cross-section of the first prism sheet perpendicular to the second plane M2 and perpendicular to the first direction D1. Figure 4 shows a cross-section of the second prism sheet perpendicular to the fourth plane M4 and perpendicular to the second direction D2.

[0074] In some examples, as shown in Figures 2 to 6, the dimming assembly of this example may include a first prism sheet 11 and a second prism sheet 12 disposed opposite each other. For example, the second prism sheet 12 and the first prism sheet 11 may be disposed sequentially on the light-emitting side of the light source assembly. The first prism sheet 11 may be located on the light-emitting side of the second prism sheet 12. 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.

[0075] In some examples, as shown in Figures 2, 3, and 5, the first prism sheet 11 may have a first surface M1 and a second surface M2 that are opposite to 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 may intersect 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.

[0076] In some examples, as shown in Figures 2, 4, and 6, 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 the second cutting angle a2 of the second prism sheet 12. The first cutting angle a1 may be different from the second cutting angle a2, so that the first direction D1 intersects the second direction D2. For example, the angle between the first direction D1 and the second direction D2 may be greater than 0 and less than 90 degrees. In some examples, the angle between the first direction D1 and the second direction D2 may be 65 to 75 degrees, for example, 70 degrees. In this example, the angle between the first direction D1 and the second direction D2 may be a clockwise angle or a counterclockwise angle between the first direction D1 and the second direction D2.

[0077] In some examples, the difference between the absolute value of the second cutting angle a2 and the absolute value of the first cutting angle a1 can range from 10 degrees to 70 degrees. As shown in Figure 5, the absolute value of the first cutting angle a1 can be greater than or equal to 20 degrees and less than or equal to 40. For example, the absolute value of the first cutting angle a1 can be greater than or equal to 25 degrees and less than or equal to 33 degrees. As shown in Figure 6, the absolute value of the second cutting angle a2 can be greater than or equal to 50 degrees and less than or equal to 90 degrees. For example, the absolute value of the second cutting angle is greater than or equal to 65 degrees and less than or equal to 80 degrees.

[0078] In some examples, as shown in FIG3 , 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.

[0079] In some examples, as shown in FIG3 , 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.

[0080] In some examples, as shown in FIG3 , the angle between the two first extension surfaces 131 and 132 is 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 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.

[0081] In some examples, as shown in FIG4 , 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.

[0082] In some examples, as shown in FIG4 , in a cross section perpendicular to the fourth plane M4 and perpendicular to the second direction D2, the cross-sectional shape of the second dimming 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.

[0083] In some examples, as shown in FIG4 , 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.

[0084] 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.

[0085] In some examples, as shown in FIG2 and FIG3 , 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.

[0086] In some examples, as shown in FIG2 and FIG4 , 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.

[0087] In some examples, as shown in FIG3 , the distance between the first intersection lines 133 of two adjacent first dimming units 130 can 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 units 140 can be the second dimming period L2 of the second prism sheet. The first dimming period L1 and the second dimming period L2 can be substantially the same.

[0088] In some examples, as shown in FIG3 , 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 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.

[0089] In some examples, as shown in FIG4 , 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.

[0090] 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.

[0091] 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.

[0092] 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, 1.5 to 1.6. 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 1.6, the scratch resistance of the prism sheet can be ensured.

[0093] 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.

[0094] FIG7A is a schematic diagram of the display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure. FIG7B is an observation diagram of the liquid crystal panel shown in FIG7A when measuring horizontal viewing angle. FIG7C is an observation diagram of the liquid crystal panel shown in FIG7A when measuring vertical viewing angle.

[0095] In some examples, as shown in Figures 7A to 7C, 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.

[0096] In some examples, as shown in FIG. 7A , 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 P T 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.

[0097] 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 LThe 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.

[0098] 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.

[0099] 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.

[0100] 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 .

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In some examples, the horizontal viewing angles ∠A and ∠B can be calculated using the following formulas:

[0105] In some examples, the vertical viewing angles ∠E and ∠F can be calculated using the following equations:

[0106] 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.

[0107] Based on the above formula, the horizontal and vertical viewing angles required for brightness testing can be calculated for LCD panels of different sizes. When the aspect ratio (H:W) of the LCD panel is fixed, the horizontal and vertical viewing angles obtained from the above formula remain unchanged. For example, when H:W = 16:9, ∠A = 17.17°, ∠B = 40.22°, ∠E = 7.55°, and ∠F = 21.96°.

[0108] 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 ).

[0109] Figure 8 is a schematic diagram of a dimming component of at least one embodiment of the present disclosure. In some examples, as shown in Figure 8, the dimming component may include: a stacked diffuser (Diffuser) 13, a second prism sheet 12, and a first prism sheet 11. The stacked structure may be referred to as a DPP (Diffuer+Prism+Prism) structure. The diffuser 13 may be located on the light-emitting side of the light source assembly, and is configured to diffuse the transmitted light and direct the diffused light toward the second prism sheet 12. The diffuser 13 may play a light mixing role. By providing the diffuser 13, the light emitted by a point light source or a line light source may be diffused to form a surface light source, thereby enabling the backlight module to provide a surface light source with sufficient brightness and uniform distribution. The diffuser 13 has high wrinkle resistance and light shielding properties.

[0110] In some examples, based on the DPP architecture, the brightness viewing angle distribution of the backlight unit (BLU) is simulated using simulation tools (such as Light Tools), and the TCO viewing angle uniformity of the backlight unit can be calculated. The influence of the monomer parameters of the prism sheet on the TCO viewing angle uniformity includes: the refractive index of the dimming part of the prism sheet, the haze of the prism sheet, and the vertex angle of the dimming part have a significant improvement on the viewing angle uniformity, while the change in the dimming cycle and the vertex angle curvature has little effect on the viewing angle uniformity. Taking the backlight module based on the DDP architecture (the backlight module of the DDP architecture can include two stacked diffusers and a prism sheet) as an example, by increasing the refractive index of the prism sheet, the simulation value of the TCO horizontal viewing angle uniformity of the backlight module can be improved from 3.68 to 3.28, and the simulation value of the TCO vertical viewing angle uniformity can be improved from 1.77 to 1.64.

[0111] In some examples, simulation tests show that when the refractive index of the first dimming portion of the first prism sheet increases by 0.01, the horizontal viewing angle uniformity of the TCO of the backlight module decreases by 0.1, and the vertical viewing angle uniformity of the TCO decreases by 0.06. When the refractive index of the second dimming portion of the second prism sheet increases by 0.01, the horizontal viewing angle uniformity of the TCO of the backlight module decreases by 0.05, and the vertical viewing angle uniformity of the TCO decreases by 0.05. When the haze of the first prism sheet increases by 10%, the horizontal viewing angle uniformity of the TCO of the backlight module decreases by 0.01, and the vertical viewing angle uniformity of the TCO decreases by 0.01. When the haze of the second prism sheet increases by 10%, the horizontal viewing angle uniformity of the TCO of the backlight module decreases by 0.02, and the vertical viewing angle uniformity of the TCO decreases by 0.04. When the top angle of the dimming portion of the prism sheet decreases by 10 degrees, the horizontal viewing angle uniformity of the TCO decreases by 0.05 to 0.2, and the vertical viewing angle uniformity of the TCO decreases by 0.2. Changing the dimming period of the prism by 10 microns increases both the horizontal and vertical viewing angle uniformity of the TCO by 0.01. When the prism's top angle is rounded, the curvature of the angle changes, which improves both the horizontal and vertical viewing angle uniformity of the TCO. The simulation test results show that the refractive index of the prism's dimming section, the haze of the prism, and the top angle of the dimming section significantly improve TCO viewing angle uniformity, while changes in the dimming period and the curvature of the top angle have little effect on TCO viewing angle uniformity.

[0112] Figure 9 illustrates the effect of the refractive index of the prism's dimming section on viewing angle. As shown in Figure 9, the refractive index of the prism's dimming section significantly influences both viewing angle and brightness. The primary effect of the refractive index on the optical viewing angle distribution is the shrinkage of highlight areas, as indicated by the arrows in Figure 9. Therefore, generally speaking, a higher refractive index results in poorer TCO viewing angle uniformity.

[0113] Figure 10 shows the effect of prism haze on viewing angle. As shown in Figure 10, haze appears as sharpness in the full viewing angle graph, i.e., the smoothness of the transition. Increasing the haze of a prism reduces the brightness of high-brightness areas, but the overall viewing angle distribution does not change. This is equivalent to the grayscale in the high-brightness areas becoming lighter overall, distributing the brightness to the low-brightness areas.

[0114] Figure 11 is a graph showing how the haze of a prism sheet affects viewing angle. In the graph shown in Figure 11, the horizontal viewing angle is the abscissa, and the ordinate is the brightness, expressed in nits. Curve K11 represents the brightness curve for a horizontal viewing angle with a haze of 0%, curve K12 represents the brightness curve for a horizontal viewing angle with a haze of 7%, curve K13 represents the brightness curve for a horizontal viewing angle with a haze of 20%, and curve K14 represents the brightness curve for a horizontal viewing angle with a haze of 30%. As shown in Figure 11, at horizontal viewing angles of 17.17 degrees and 40.22 degrees, brightness decreases as haze increases. At a horizontal viewing angle of 17.17 degrees, the brightness decreases more rapidly as haze increases, resulting in improved TCO viewing angle uniformity.

[0115] Figure 12 shows the full-viewing angle distribution of brightness after the first and second prism sheets of the dimming assembly are rotated simultaneously. In this example, assuming the first trimming angle of the first prism sheet is 0 degrees and the second trimming angle of the second prism sheet is 0 degrees, the first and second prism sheets are simultaneously rotated counterclockwise from 0 degrees to 180 degrees about the horizontal line (i.e., the third direction). During this rotation, the angle between the extension direction of the first dimming portion of the first prism sheet (i.e., the first direction) and the extension direction of the second dimming portion of the second prism sheet (i.e., the second direction) is 0 degrees. As shown in Figure 12, the shape of the full-viewing angle distribution remains unchanged; only the corresponding angle is rotated.

[0116] Figure 13 is a full-view distribution diagram of brightness after the second prism sheet of the dimming component is fixed and the first prism sheet is rotated. In this example, the structures of the first prism sheet and the second prism sheet can be roughly the same. The first cutting angle of the second prism sheet is 0 degrees, and the second prism sheet is fixed so that the first prism sheet rotates one circle counterclockwise around the horizontal line. During the rotation process, the angle between the extension direction of the first dimming part of the first prism sheet (i.e., the first direction) and the extension direction of the second dimming part of the second prism sheet (i.e., the second direction) will change. As can be seen from Figure 13, the first central axis of the full-view distribution shape (the dotted line with an arrow in Figure 13) will rotate by a corresponding angle.

[0117] Figure 14 is a full-view distribution diagram of brightness after the first prism sheet of the dimming component is fixed and the second prism sheet is rotated. In this example, the structures of the first prism sheet and the second prism sheet can be roughly the same. The first cutting angle of the first prism sheet is 0 degrees, and the first prism sheet is fixed so that the second prism sheet rotates counterclockwise around the horizontal line. During the rotation process, the angle between the extension direction of the first dimming part of the first prism sheet (i.e., the first direction) and the extension direction of the second dimming part of the second prism sheet (i.e., the second direction) will change. As can be seen from Figure 14, the two end portions of the second central axis direction of the full-view distribution shape (the bright area circled by the dotted circle in Figure 14) will rotate by a corresponding angle and gradually darken as the rotation angle increases.

[0118] As can be seen from the full-viewing angle brightness distribution diagrams in Figures 12 to 14, the direction of the first central axis of the full-viewing angle distribution shape is determined by the first cutting angle of the first prism sheet, while the brightness at both ends of the second central axis of the full-viewing angle distribution shape is related to the angle between the first and second prism sheets (i.e., the angle between the extension direction of the first dimming portion of the first prism sheet and the extension direction of the second dimming portion of the second prism sheet). This shows that the first cutting angle of the first prism sheet and the angle between the first and second prism sheets affect the viewing angle uniformity of the TCO.

[0119] Below, we examine how the TCO viewing angle uniformity changes when rotating the second prism sheet clockwise and counterclockwise, assuming the first cutting angle of the first prism sheet is 0 degrees. The angle between the first and second prism sheets, described below, refers to the angle between the extension direction of the first dimming portion of the first prism sheet (i.e., the first direction) and the extension direction of the second dimming portion of the second prism sheet (i.e., the second direction).

[0120] Figure 15A is a graph showing the change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated clockwise. Figure 15B is a graph showing the change in TCO vertical viewing angle uniformity after the second prism sheet is rotated clockwise. Figure 16A is a graph showing the change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated counterclockwise. Figure 16B is a graph showing the change in TCO vertical viewing angle uniformity after the second prism sheet is rotated counterclockwise.

[0121] The horizontal axis in Figures 15A to 16B represents the rotation angle of the first prism sheet. The rotation angle of the first prism sheet is the angle between the first direction (i.e., the extension direction of the first dimming unit) and the horizontal line after the rotation of the first prism sheet with a first cutting angle of 0 degrees. It can be equivalent to the first cutting angle of the first prism sheet when the third direction is parallel to the horizontal line. The vertical axis in Figures 15A and 16A represents the horizontal viewing angle uniformity of the TCO, and the vertical axis in Figures 15B and 16B represents the vertical viewing angle uniformity of the TCO.

[0122] In FIG15A , curves K21 to K28 represent TCO horizontal viewing angle uniformity curves at different angles between the first prism sheet and the second prism sheet. Curve K21 corresponds to an angle of 0 degrees between the first prism sheet and the second prism sheet, curve K22 corresponds to an angle of 10 degrees between the first prism sheet and the second prism sheet, curve K23 corresponds to an angle of 20 degrees between the first prism sheet and the second prism sheet, curve K24 corresponds to an angle of 45 degrees between the first prism sheet and the second prism sheet, curve K25 corresponds to an angle of 60 degrees between the first prism sheet and the second prism sheet, curve K26 corresponds to an angle of 70 degrees between the first prism sheet and the second prism sheet, curve K27 corresponds to an angle of 80 degrees between the first prism sheet and the second prism sheet, and curve K28 corresponds to an angle of 90 degrees between the first prism sheet and the second prism sheet.

[0123] In FIG15B , curves K31 to K38 represent TCO vertical viewing angle uniformity curves at different angles between the first prism sheet and the second prism sheet. Curve K31 corresponds to an angle of 0 degrees between the first prism sheet and the second prism sheet, curve K32 corresponds to an angle of 10 degrees between the first prism sheet and the second prism sheet, curve K33 corresponds to an angle of 20 degrees between the first prism sheet and the second prism sheet, curve K34 corresponds to an angle of 30 degrees between the first prism sheet and the second prism sheet, curve K35 corresponds to an angle of 45 degrees between the first prism sheet and the second prism sheet, curve K26 corresponds to an angle of 60 degrees between the first prism sheet and the second prism sheet, curve K27 corresponds to an angle of 70 degrees between the first prism sheet and the second prism sheet, and curve K28 corresponds to an angle of 80 degrees between the first prism sheet and the second prism sheet.

[0124] In FIG16A , curves K41 to K47 represent TCO horizontal viewing angle uniformity curves at different angles between the first prism sheet and the second prism sheet. Curve K41 corresponds to an angle of 0 degrees between the first prism sheet and the second prism sheet, curve K42 corresponds to an angle of 10 degrees between the first prism sheet and the second prism sheet, curve K43 corresponds to an angle of 20 degrees between the first prism sheet and the second prism sheet, curve K44 corresponds to an angle of 30 degrees between the first prism sheet and the second prism sheet, curve K45 corresponds to an angle of 45 degrees between the first prism sheet and the second prism sheet, curve K46 corresponds to an angle of 60 degrees between the first prism sheet and the second prism sheet, and curve K47 corresponds to an angle of 70 degrees between the first prism sheet and the second prism sheet.

[0125] In FIG16B , curves K51 to K59 represent TCO vertical viewing angle uniformity curves at different angles between the first prism sheet and the second prism sheet. Curve K51 corresponds to an angle of 0 degrees between the first prism sheet and the second prism sheet, curve K52 corresponds to an angle of 10 degrees between the first prism sheet and the second prism sheet, curve K53 corresponds to an angle of 20 degrees between the first prism sheet and the second prism sheet, curve K54 corresponds to an angle of 30 degrees between the first prism sheet and the second prism sheet, curve K55 corresponds to an angle of 45 degrees between the first prism sheet and the second prism sheet, curve K56 corresponds to an angle of 60 degrees between the first prism sheet and the second prism sheet, curve K57 corresponds to an angle of 70 degrees between the first prism sheet and the second prism sheet, curve K58 corresponds to an angle of 80 degrees between the first prism sheet and the second prism sheet, and curve K59 corresponds to an angle of 90 degrees between the first prism sheet and the second prism sheet.

[0126] As can be seen from Figures 15A to 16B, when the included angle between the first and second prism sheets is 0 degrees, the optimal TCO horizontal viewing angle uniformity corresponds to two rotational positions of the first prism sheet: one at 30 degrees and 210 degrees, and the other at 150 degrees and 330 degrees. When the included angle between the first and second prism sheets is greater than 0 degrees, the optimal TCO horizontal viewing angle uniformity corresponds to a rotational position of the first prism sheet when the second prism sheet is rotated clockwise, which is near 30 degrees and 210 degrees. When the included angle between the first and second prism sheets is greater than 0 degrees, the optimal TCO horizontal viewing angle uniformity corresponds to a rotational position of the first prism sheet when the second prism sheet is rotated counterclockwise, which is near 150 degrees and 330 degrees. Therefore, the optimal TCO horizontal viewing angle uniformity is achieved when the first cutting angle of the first prism sheet is 30 degrees or -30 degrees.

[0127] Figure 17A is a graph showing how TCO viewing angle uniformity changes with the rotation angle of the second prism sheet. Figure 17B is a graph showing how brightness changes with the angle between the first and second prism sheets. The horizontal axis in Figure 17A represents the rotation angle of the second prism sheet, and the vertical axis in Figure 17A represents TCO viewing angle uniformity. The horizontal axis in Figure 17B represents the angle between the first and second prism sheets, and the vertical axis in Figure 17B represents brightness (in nits).

[0128] Curve K61 in Figure 17A shows the TCO horizontal viewing angle uniformity curve when the first prism sheet has a first cutting angle of 30 degrees and the second prism sheet is rotated clockwise. Curve K62 shows the TCO horizontal viewing angle uniformity curve when the first prism sheet has a first cutting angle of 150 degrees (i.e., -30 degrees) and the second prism sheet is rotated counterclockwise. Curve K63 shows the TCO vertical viewing angle uniformity curve when the first prism sheet has a first cutting angle of 30 degrees and the second prism sheet is rotated clockwise. Curve K64 shows the TCO vertical viewing angle uniformity curve when the first prism sheet has a first cutting angle of 150 degrees and the second prism sheet is rotated counterclockwise.

[0129] As shown in Figure 17A, when the angle between the first and second prism sheets is approximately 70 degrees, both the TCO horizontal and vertical viewing angle uniformity are excellent. As shown in Figure 17B, when the angle between the first and second prism sheets is approximately 90 degrees, the brightness is maximum. From 40 to 90 degrees, the brightness gradually decreases as the angle decreases.

[0130] Combined with the above analysis of the impact of the refractive index and haze of the prism sheet on the viewing angle, as well as the analysis of the impact of the angle between the double prism sheets, it can be seen that by increasing the refractive index of the dimming part of the first prism sheet and the second prism sheet, the TCO viewing angle uniformity can be reduced and the brightness can be improved; by increasing the haze of the first prism sheet and the second prism sheet, the TCO viewing angle uniformity can be reduced and the brightness can be reduced; by selecting a prism sheet with an appropriate cutting angle, the brightness can be improved at a large viewing angle while improving the brightness by changing the refractive index or haze, which can have a positive impact on the TCO viewing angle uniformity.

[0131] Figure 18 is a diagram showing the full viewing angle distribution of brightness, which is influenced by the angle between the first prism sheet and the second prism sheet and the refractive index of the first dimming unit and the second dimming unit. In some examples, as shown in Figure 18, when the angle between the first prism sheet and the second prism sheet is 70 degrees, the TCO horizontal viewing angle uniformity is 1.315, and when the angle between the first prism sheet and the second prism sheet is 75 degrees, the TCO horizontal viewing angle uniformity is 1.625. Assuming that the conversion ratio between the TCO viewing angle uniformity of the backlight module and the liquid crystal panel is 1.2, the angle between the first prism sheet and the second prism sheet can be set to 70 degrees to take into account the viewing angle and brightness requirements of the liquid crystal panel.

[0132] According to the above analysis and tests, the absolute value range of the first cutting angle of the first prism sheet can be 20 degrees to 40 degrees, such as 25 degrees to 33 degrees, for example, the first cutting angle can be approximately 30 degrees or -30 degrees. The absolute value range of the second cutting angle of the second prism sheet can be 50 degrees to 90 degrees, such as 65 degrees to 80 degrees. The angle between the first prism sheet and the second prism sheet can be designed by setting the cutting angles of the first prism sheet and the second prism sheet. For example, the angle between the two can range from 65 degrees to 75 degrees, such as the angle between the two can be approximately 70 degrees, so as to achieve a balance between viewing angle and brightness requirements. Among them, when the second cutting angle of the second prism sheet is lower than 65 degrees, the brightness loss is serious; when the second cutting angle of the second prism sheet is higher than 80 degrees, the TCO viewing angle uniformity cannot be achieved. The range setting of the cutting angles of the first prism sheet and the second prism sheet in this example can take into account both viewing angle and brightness requirements.

[0133] Based on the above analysis and testing, it can be seen that the higher the refractive index of the dimming portion of the prism sheet, the higher the brightness and the better the TCO viewing angle uniformity. However, when the refractive index of the dimming portion is greater than 1.6, the scratch resistance of the prism sheet decreases significantly. The refractive index of the dimming portion of the prism sheet in this example can range from 1.45 to 1.7, for example, from 1.5 to 1.6. If the first and second prism sheets have appropriate cutting angles, the refractive index can be fully utilized to meet the brightness and viewing angle requirements.

[0134] Based on the above analysis and testing, the haze of the first prism sheet can range from 10% to 45%, for example, from 15% to 30%. When the haze of the first prism sheet is less than 15%, the shielding performance is poor. When the haze of the first prism sheet is greater than 30%, the brightness loss is significant. The haze of the second prism sheet can range from 10% to 45%. For example, it can range from 25% to 45%. When the haze of the second prism sheet is lower than 25%, TCO viewing angle uniformity cannot be achieved. When the haze of the second prism sheet is higher than 45%, the brightness loss is significant. Under the condition that the first prism sheet and the second prism sheet have appropriate cutting angles, the haze can be fully utilized to meet the brightness and viewing angle requirements.

[0135] FIG19 is another schematic diagram of a dimming component according to at least one embodiment of the present disclosure. In some examples, as shown in FIG19 , the dimming component may include: a stacked second prism sheet 12, a first prism sheet 11, and a reflective polarized brightness enhancement film (DBEF) 14. The DBEF 14 may be located on a side of the first prism sheet 11 away from the second prism sheet 12, and the DBEF 14 may be located on the light-emitting side of the first prism sheet 11. Providing the DBEF can reduce light loss and increase brightness gain. For the description of the first prism sheet 11 and the second prism sheet 12, reference can be made to the description of the aforementioned embodiment, so these descriptions will not be repeated here.

[0136] Figure 20 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 20, 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 30 may include 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.

[0137] In some examples, as shown in FIG20 , the liquid crystal panel 20 may primarily include an array substrate, an alignment substrate, and a liquid crystal layer located between the array substrate and the alignment 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.

[0138] 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.

[0139] 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 form 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 disposed opposite to each other; The first prism sheet has a first surface and a second surface facing each other, the first surface including: a plurality of first dimming portions extending along a first direction and arranged in an array; the first prism sheet further has at least one first side surface extending along a third direction and connecting the first surface and the second surface; an angle between the third direction and the first direction is a first cutting angle of the first prism sheet; an absolute value of the first cutting angle is greater than or equal to 20 degrees and less than or equal to 40 degrees; The second prism sheet has a third surface and a fourth surface relative to each other, and the third surface is located on the side of the second prism sheet close to the first prism sheet; the third surface includes: a plurality of second dimming parts extending along the second direction and arranged in an array; the angle between the first direction and the second direction is greater than 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 25 degrees and less than or equal to 33 degrees.

3. The dimming component according to claim 1, wherein: The included angle between the first direction and the second direction ranges from 65 degrees to 75 degrees.

4. The dimming component according to claim 1, wherein: The second prism sheet has at least one second side surface extending along the third direction and connecting the third surface and the fourth surface, 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 is greater than the absolute value of the first cutting angle.

5. The dimming component according to claim 4, wherein: A difference between an absolute value of the second cutting angle and an absolute value of the first cutting angle ranges from 10 degrees to 70 degrees.

6. The dimming component according to claim 4, wherein: An absolute value of the second cutting angle is greater than or equal to 50 degrees and less than or equal to 90 degrees.

7. 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 80 degrees.

8. The dimming component according to any one of claims 1 to 7, 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.

9. The dimming component according to claim 8, 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 1.5 to 1.

6.

10. The dimming component according to claim 8, wherein: The haze of the first prism sheet and the second prism sheet ranges from 10% to 45%.

11. The dimming component according to claim 10, wherein: An absolute value of a difference in haze between the first prism sheet and the second prism sheet ranges from 5% to 30%.

12. The dimming component according to claim 8, wherein: The first dimming portion of the first prism sheet has two first extension surfaces extending along the first direction. In a cross section perpendicular to the second surface and perpendicular to the first direction, an angle between the two first extension surfaces ranges from 87 degrees to 92 degrees.

13. The dimming component according to claim 12, wherein: The second dimming portion of the second prism sheet has two second extension surfaces extending along the second direction. In a cross section perpendicular to the fourth surface and perpendicular to the second direction, an 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, further comprising: The diffusion sheet is located on a side of the second prism sheet away from the first prism sheet and is configured to diffuse the light passing through the second prism sheet and direct the diffused light toward the second prism sheet.

15. The dimming component according to any one of claims 1 to 14, further comprising: A reflective polarized brightness enhancement film is located on a side of the first prism sheet away from the second prism sheet. 16 . A backlight module, comprising a light source assembly and a dimming assembly according to claim 1 , wherein the light source assembly is configured to generate light directed toward the dimming assembly.

17. A display device comprising the backlight module according to claim 16 and a liquid crystal panel located on a light-emitting side of the backlight module.

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