Dimming assembly, backlight module and display device

Abstract

The dimming assembly comprises a first prismatic lens and a second prismatic lens which are oppositely arranged. The first prismatic lens is provided with a first surface and a second surface which are opposite, and the first surface comprises a plurality of first dimming parts which extend in the first direction and are arranged in an array mode. The first prismatic lens is further provided with at least one first side face which extends in the third direction and is connected with the first surface and the second surface, and an included angle between the third direction and the first direction is a first cutting angle of the first prismatic lens. The absolute value of the first cut angle is larger than or equal to 20 degrees and smaller than or equal to 40 degrees. The second prism sheet has a third surface and a fourth surface which are opposite. The third surface is located on the side, close to the first prismatic lens, of the second prismatic lens. The third surface comprises a plurality of second dimming parts which extend in the second direction and are arranged in an array mode. The included angle between the first direction and the second direction is larger than 0 degree and smaller than 90 degrees.

Description

Technical Field

[0001] The present invention 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 requirements for the performance of displays. How to create products with higher brightness and higher picture quality is a major challenge facing the display industry. Especially the high dynamic range (HDR) standard that has emerged in recent years. Compared with the standard dynamic range (SDR), HDR can provide higher brightness, better contrast, color accuracy and more vivid colors. However, there are many technical difficulties for LCD display manufacturers in reaching the HDR standard. Among them, sacrificing the viewing angle of the module to achieve high brightness is one of the common technical problems in the industry. Summary of the invention

[0003] 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.

[0004] The embodiments of the present disclosure provide a dimming component, a backlight module and a display device.

[0005] 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 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 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 opposite to each other. The third surface is located on a 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.

[0006] 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.

[0007] In some exemplary embodiments, the angle between the first direction and the second direction ranges from 65 degrees to 75 degrees.

[0008] 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.

[0009] 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.

[0010] 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.

[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 80 degrees.

[0012] In some exemplary embodiments, the refractive index of the first light modulator of the first prism sheet and the second light modulator of the second prism sheet ranges from 1.45 to 1.7.

[0013] In some exemplary embodiments, the refractive index of the first light modulator of the first prism sheet and the second light modulator of the second prism sheet ranges from 1.5 to 1.6.

[0014] In some exemplary embodiments, the haze of the first prism sheet and the second prism sheet ranges from 10% to 45%.

[0015] 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%.

[0016] 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.

[0017] 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.

[0018] In some exemplary embodiments, the dimming component further includes: a diffusion sheet, which 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.

[0019] 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.

[0020] On the other hand, this embodiment provides a backlight module, including a light source component and the dimming component as described above, wherein the light source component is configured to generate light directed toward the dimming component.

[0021] 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.

[0022] Other aspects will be apparent upon reading and understanding the drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide 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 on the technical solution of the present disclosure.

[0024] Figure 1 This is a full viewing angle distribution diagram of a backlight module using two prism sheets with perpendicular prism angles;

[0025] Figure 2 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0026] Figure 3 is a cross-sectional schematic diagram of a first prism sheet according to at least one embodiment of the present disclosure;

[0027] Figure 4 is a cross-sectional schematic diagram of a second prism sheet according to at least one embodiment of the present disclosure;

[0028] Figure 5 is a schematic top view of a first prism sheet according to at least one embodiment of the present disclosure;

[0029] Figure 6 is a schematic top view of a second prism sheet according to at least one embodiment of the present disclosure;

[0030] Fig. 7A is a schematic diagram of a display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure;

[0031] Figure 7B for Fig. 7A The observation diagram of the liquid crystal panel shown when measuring the horizontal viewing angle;

[0032] Figure 7C for Fig. 7A The observation diagram of the liquid crystal panel shown when measuring the vertical viewing angle;

[0033] Figure 8 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0034] Fig. 9 Schematic diagram of the effect of the refractive index of the light-adjusting portion of the prism sheet on the viewing angle;

[0035] Fig.10 Schematic diagram of the effect of the haze of the prism sheet on the viewing angle;

[0036] Fig.11 is a graph showing the effect of the haze of the prism sheet on the viewing angle;

[0037] Fig.12 A full-viewing angle distribution diagram of brightness after the first prism sheet and the second prism sheet of the dimming component rotate simultaneously;

[0038] Fig.13 The full-viewing angle distribution diagram of brightness after the second prism sheet of the dimming component is fixed and the first prism sheet is rotated;

[0039] Fig.14 A full-viewing angle distribution diagram of brightness after the first prism sheet of the dimming component is fixed and the second prism sheet is rotated;

[0040] Fig.15A is a curve diagram showing the change of TCO horizontal viewing angle uniformity after the second prism sheet is rotated clockwise;

[0041] Fig. 15B is a curve diagram showing the change of TCO vertical viewing angle uniformity after the second prism sheet is rotated clockwise;

[0042] Fig.16A is a curve diagram showing the change of TCO horizontal viewing angle uniformity after the second prism sheet is rotated counterclockwise;

[0043] Fig. 16B is a curve diagram showing the change of the uniformity of the vertical viewing angle of TCO after the second prism sheet is rotated counterclockwise;

[0044] Fig.17A is a curve diagram showing the change of TCO viewing angle uniformity with the rotation angle of the second prism sheet;

[0045] Fig. 17B is a curve diagram showing the change of brightness as the angle between the first prism sheet and the second prism sheet changes;

[0046] Fig.18 A brightness distribution diagram at all viewing angles combined with the included 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;

[0047] Fig.19 is another schematic diagram of a dimming component according to at least one embodiment of the present disclosure;

[0048] Fig. 20 is a schematic diagram of a display device according to at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] The embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The embodiments can be implemented in a plurality of different forms. A person skilled in the art can easily understand the fact 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 in the present disclosure and the features in the embodiments can be arbitrarily combined with each other.

[0050] In the drawings, the size of one or more components, the thickness of a layer, or an area is sometimes exaggerated for the sake of clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to the size, and the shape and size of one or more components in the drawings do not reflect the true proportion. In addition, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0051] The ordinal numbers such as "first", "second", and "third" in this specification are provided to avoid confusion of constituent elements, and are not intended to limit the quantity. The "plurality" in this disclosure means two or more.

[0052] In this specification, for the sake of convenience, the words and phrases indicating the orientation or positional relationship such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are used to illustrate the positional relationship of the constituent elements with reference to the drawings. This is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the orientation of the constituent elements being described. Therefore, it is not limited to the words and phrases described in the specification, and can be appropriately replaced according to the circumstances.

[0053] In this specification, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or a connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the meanings of the above terms in this disclosure can be understood according to the circumstances.

[0054] In this specification, "parallel" means a state where the angle formed by two straight lines is greater than -10° and less than 10°, and therefore, also includes a state where the angle is greater than -5° and less than 5°. In addition, "perpendicular" means a state where the angle formed by two straight lines is greater than 80° and less than 100°, and therefore, also includes a state where the angle is greater than 85° and less than 95°.

[0055] 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.

[0056] In this disclosure, "approximately" and "roughly" mean that the limits are not strictly defined, and the situation within the process and measurement error range is allowed. In this disclosure, "roughly the same" means that the numerical values ​​differ by less than 10%. "Symmetrical" in this disclosure means that the limits are not strictly defined, and the situation within the process and measurement error range is allowed.

[0057] 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 then 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, and the optical film prism sheet can use optical refraction to form a brightness improvement at the central viewing angle. For example, the dimming component can use two prism sheets with mutually perpendicular prism angles stacked (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), and the light in the horizontal and vertical directions is converged 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. Figure 1 This is a full viewing angle distribution diagram of a backlight module using two prism sheets with perpendicular prism 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 is represented by different grayscales. Figure 1 As shown in the figure, the brightness at a wide viewing angle drops significantly, and the horizontal and vertical viewing angles cannot reach a good state. Due to the effect of the prism, while improving the brightness at the front viewing angle, the viewing angle distribution will be seriously affected, so that the viewing angle and brightness of the backlight module restrict each other, and it is impossible to take into account the viewing angle and brightness requirements, 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.

[0058] The present 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.

[0059] The present 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 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 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 opposite to each other. The third surface is located on a 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.

[0060] In this example, the positive or negative sign of the angle indicates the direction of rotation to form the angle, not the size of the angle. A positive angle indicates an angle formed by counterclockwise rotation, and a negative angle indicates an angle formed by clockwise rotation.

[0061] 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.

[0062] 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.

[0063] In some exemplary embodiments, the angle between the first direction and the second direction may range from 65 degrees to 75 degrees, such as about 70 degrees. This example can facilitate compatible realization of brightness and viewing angle requirements by setting the angle between the first direction and the second direction.

[0064] 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 where the brightness loss is severe 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 where the TCO viewing angle requirement cannot be met can be avoided.

[0065] In some exemplary embodiments, the refractive index of the first dimming part of the first prism sheet and the second dimming part of the second prism sheet may range from 1.45 to 1.7, that is, the refractive index of the first dimming part of the first prism sheet and the second dimming part 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 part of the first prism sheet and the second dimming part of the second prism sheet may range from 1.5 to 1.6, that is, the refractive index of the first dimming part of the first prism sheet and the second dimming part 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 part, it is beneficial to improve the brightness and TCO viewing angle uniformity. Moreover, when the refractive index of the material used in the dimming part 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.

[0066] 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 is poor, and when the haze of the first prism sheet is greater than 30%, the brightness loss is obvious; when the haze of the second prism sheet is less than 25%, the TCO viewing angle requirement cannot be met, and when the haze of the second prism sheet is greater than 45%, the brightness loss is obvious. 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.

[0067] 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 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, such as 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 the 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, such as 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.

[0068] The solution of this embodiment is described below by means of some examples.

[0069] Figure 2 is a schematic diagram of a dimming component according to at least one embodiment of the present disclosure. Figure 3 Schematic diagram of a cross-section of a first prism sheet according to at least one embodiment of the present disclosure. Figure 4 Schematic diagram of a cross-section of a second prism sheet according to at least one embodiment of the present disclosure. Figure 5 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 of at least one embodiment of the present disclosure. Figure 3 The cross section of the first prism sheet is perpendicular to the second plane M2 and perpendicular to the first direction D1. Figure 4 Shown is a cross section of the second prism sheet perpendicular to the fourth plane M4 and perpendicular to the second direction D2.

[0070] In some examples, such as Figures 2 to 6 As shown, the dimming component of this example may include a first prism sheet 11 and a second prism sheet 12 that are arranged opposite to each other. For example, the second prism sheet 12 and the first prism sheet 11 may be arranged in sequence 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.

[0071] In some examples, such as Figure 2 , Figure 3 and Figure 5As shown, the first prism sheet 11 may have a first surface M1 and a second surface M2 relative to each other. The first surface M1 may include a plurality of first dimming parts 130 extending along the 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 connecting the first surface M1 and the second surface M2. The two first side surfaces 11a may extend along the third direction X and be arranged oppositely along the fourth direction Y. The two third side surfaces 11b may extend along the fourth direction Y and be arranged oppositely along the third direction X. The first side surface 11a may connect the edge of the first surface M1 in the fourth direction Y with the same side edge of the second surface M2 in the fourth direction Y, and the third side surface 11b may connect the edge of the first surface M1 in the third direction X with the same side edge of the second surface M2 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. Wherein, the third direction X may be perpendicular to the fourth direction Y. The plane where the third direction X and the fourth direction Y are located may be a horizontal plane, the third direction X may be parallel to the horizontal line, and the fifth direction Z may be perpendicular to the plane where the third direction X and the fourth direction Y are located. 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 with 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.

[0072] In some examples, such as Figure 2 , Figure 4 and Figure 6As shown, the second prism sheet 12 may have a third surface M3 and a fourth surface M4 relative to each other. 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 surface M3 and the fourth surface M4. The two second side surfaces 12a may both extend along the third direction X and be arranged oppositely in the fourth direction Y. The two fourth side surfaces 12b may both extend along the fourth direction Y and be arranged oppositely in the third direction X. The second side surface 12a may connect the edge of the third surface M3 in the fourth direction Y with the same side edge of the fourth surface M4 in the fourth direction Y, and the fourth side surface 12b may connect the edge of the third surface M3 in the third direction X with the same side edge of the fourth surface M4 in the third direction X. For example, the two third side surfaces 12a and the two fourth side surfaces 12b may 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 with 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. The angle between the first direction D1 and the second direction D2 of this example may be a clockwise angle or a counterclockwise angle between the first direction D1 and the second direction D2.

[0073] 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 may range from 10 degrees to 70 degrees. Figure 5 As shown, the absolute value of the first cutting angle a1 may be greater than or equal to 20 degrees and less than or equal to 40 degrees. For example, the absolute value of the first cutting angle a1 may be greater than or equal to 25 degrees and less than or equal to 33 degrees. Figure 6 As shown, the absolute value of the second cutting angle a2 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 a2 may be greater than or equal to 65 degrees and less than or equal to 80 degrees.

[0074] In some examples, such as Figure 3 As shown, each first dimming unit 130 may include two first extension surfaces 131 and 132 extending along the first direction D1, and the extension edges of the two first extension surfaces 131 and 132 intersect on the side away from the second surface M2. The 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.

[0075] In some examples, such as Figure 3 As shown, 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 may be a triangle, for example, an isosceles triangle. The angle between the first extension surface 131 and the second plane M2 may 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 may be substantially symmetrical about the first intersection line 133.

[0076] In some examples, such as Figure 3 As shown, the angle between the two first extension surfaces 131 and 132 is b1. b1 can be called the vertex angle of the first dimming unit 130. In some examples, the angle b1 between the two first extension surfaces 131 and 132 can be 87 degrees to 92 degrees, for example, 90 degrees. By setting the angle between the two first extension surfaces 131 and 132 to be approximately 90 degrees, a better brightness can be achieved. In other examples, the connection position of the two first extension surfaces 131 and 132 can form a rounded corner.

[0077] In some examples, such as Figure 4 As shown, each second dimming unit 140 may include two second extension surfaces 141 and 142 extending along the second direction D2, and the extension edges of the two second extension surfaces 141 and 142 intersect on the side away from the fourth surface M4. The 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.

[0078] In some examples, such as Figure 4 As shown, 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 may be a triangle, for example, an isosceles triangle. The angle between the second extension surface 141 and the fourth plane M4 may 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 may be substantially symmetrical about the second intersection line 143.

[0079] In some examples, such as Figure 4 As shown, the angle between the two second extension surfaces 141 and 142 is b2. b2 can be called the vertex angle of the second dimming unit 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 degrees to 92 degrees, for example, 90 degrees. By setting the angle between the two second extension surfaces 141 and 142 to be approximately 90 degrees, a better brightness can be achieved. In other examples, the connection position of the two second extension surfaces 141 and 142 can form a rounded corner.

[0080] 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 surfaces that are approximately planes, for example, surfaces that are approximately planes allow for protrusions or depressions caused by a manufacturing process. The second surface M2 may be parallel to the fourth surface M4.

[0081] In some examples, such as Figure 2 and Figure 3 As shown, the plurality of first dimming parts 130 of the first prism sheet 11 may 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 may be distributed at intervals 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.

[0082] In some examples, such as Figure 2 and Figure 4 As shown, the plurality of second dimming parts 140 of the second prism sheet 12 may 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 may be distributed at intervals 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.

[0083] In some examples, such as Figure 3 As shown, the distance between the first intersection lines 133 of two adjacent first dimming units 130 may be the first dimming period (Pitch) L1 of the first prism sheet. Figure 4 As shown, the distance between the second intersection lines 143 of two adjacent second dimming parts 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.

[0084] In some examples, such as Figure 3 As shown, 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, and the first prism layer may include a plurality of first dimming 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, so as to prevent the first prism layer from being damaged.

[0085] In some examples, such as Figure 4As shown, 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 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 dimming units 140. The fourth surface M4 of the second prism sheet 12 may be a surface of the second coating 121 on a side away from the second substrate 120. The second coating 121 may be used to provide protection, increase wear resistance and scratch resistance, so as to prevent the second prism layer from being damaged.

[0086] In some examples, the first substrate 110 and the second substrate 120 can be made of polyethylene terephthalate (PET) material. The PET material has good transparency and the greatest toughness among thermoplastics, which can ensure the firm structure of the prism sheet. In addition, the PET material has good electrical insulation properties and is less affected by temperature, which can ensure the stability of the optical properties of the prism sheet.

[0087] In some examples, the material of the first coating 111 and the second coating 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. In this example, by setting the first coating and the second coating, the haze of the first prism 11 and the second prism 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 degree.

[0088] In some examples, the refractive index of the first dimming unit 130 and the second dimming unit 140 may be 1.45 to 1.7, for example, 1.5 to 1.6. In some examples, the first dimming unit 130 and the second dimming unit 140 may be made of the same material, and the refractive index of the first dimming unit 130 and the second dimming unit 140 may be the same. In other examples, the refractive index of the first dimming unit 130 and the second dimming unit 140 may be different. This embodiment is not limited to this. By setting the refractive index of the dimming unit to be less than or equal to 1.6, the scratch resistance of the prism sheet can be ensured.

[0089] 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 (VerticalViewing Angle). The horizontal viewing angle refers to the angle range that can be observed from the left to the right of the display screen in the horizontal direction. The horizontal viewing angle can indicate the width range of the content on the screen that the user can see 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 can indicate the height range of the content on the screen that the user can see when using the display normally.

[0090] Fig. 7A A schematic diagram of a display area of ​​a liquid crystal panel according to at least one embodiment of the present disclosure. Figure 7B for Fig. 7A The LCD panel shown is observed when measuring the horizontal viewing angle. Figure 7C for Fig. 7A The shown diagram is an observation diagram of the LCD panel when measuring the vertical viewing angle.

[0091] In some examples, such as 7A to 7C As shown, the liquid crystal panel 20 may have a rectangular display area 200. This example uses a camera 30 to measure the viewing angle. The viewing distance between the camera 30 and the liquid crystal panel 20 (i.e., the vertical distance between the camera 30 and the liquid crystal panel 20) may be a conventional observation distance, such as about 1 meter.

[0092] In some examples, such as Fig. 7A As shown, the display area 200 may have a first position P L , the second position P R , the third position P T , the 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 The third position P may be located on the middle line of the display area 200 in the fourth direction Y. T and the fourth position P B It can be located at the center position P along the fourth direction Y C The two sides, that is, 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.

[0093] 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 (eg, right boundary) of the display area 200 along the third direction may be W2. W1 may be equal to W2, for example, both are W / 10.

[0094] 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, the 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.

[0095] In some examples, when the camera 30 is used to view the liquid crystal panel 20, the frequency and range of left-right movement are usually greater than the frequency and range of up-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 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 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, for example, 1.73.

[0096] 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 Vertical viewing angle uniformity of the second TCO A 垂直2 .

[0097]

[0098]

[0099]

[0100] 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° 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+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° It represents the maximum brightness value obtained when the observation angle θ2 is -15 degrees. min-15° It indicates the minimum brightness value obtained when the observation angle θ2 is -15 degrees.

[0101] In some examples, the first TCO vertical viewing angle uniformity A may be selected to be 垂直1 Vertical viewing angle uniformity of the second TCO A 垂直2 The larger one is used as the TCO vertical viewing angle uniformity.

[0102] Based on the testing principle of TCO horizontal viewing angle and vertical viewing angle, in order to facilitate simulation, the calculation of the aforementioned TCO viewing angle uniformity can be converted into the brightness ratio of the center point at different viewing angles.

[0103] In some examples, the horizontal viewing angles ∠A and ∠B may be calculated by the following formula:

[0104]

[0105]

[0106] In some examples, the vertical viewing angles ∠E and ∠F can be calculated by the following formulas:

[0107]

[0108]

[0109] Wherein, D represents the diagonal size of the liquid crystal panel, H represents the length of the liquid crystal panel in the fourth direction Y, and W represents the length of the liquid crystal panel in the third direction X.

[0110] According to 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 (i.e. H:W) of the LCD panel is fixed, the horizontal and vertical viewing angles obtained by 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°.

[0111] 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 Vertical viewing angle uniformity of the second TCO A 垂直2 ).

[0112]

[0113]

[0114]

[0115] Figure 8 Schematic diagram of a dimming component according to at least one embodiment of the present disclosure. Figure 8 As shown, 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, so that the backlight module may provide a surface light source with sufficient brightness and uniform distribution. The diffuser 13 has high wrinkle resistance and light shielding properties.

[0116] 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 obvious improvements on the viewing angle uniformity, while the changes in the dimming cycle and the vertex angle have 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 diffusers and a prism sheet stacked) 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.

[0117] In some examples, according to simulation tests, the refractive index of the first dimming part of the first prism sheet increases by 0.01, the TCO horizontal viewing angle uniformity of the backlight module decreases by 0.1, and the TCO vertical viewing angle uniformity decreases by 0.06; the refractive index of the second dimming part of the second prism sheet increases by 0.01, the TCO horizontal viewing angle uniformity of the backlight module decreases by 0.05, and the TCO vertical viewing angle uniformity decreases by 0.05. The haze of the first prism sheet increases by 10%, the TCO horizontal viewing angle uniformity of the backlight module decreases by 0.01, and the TCO vertical viewing angle uniformity decreases by 0.01; the haze of the second prism sheet increases by 10%, the TCO horizontal viewing angle uniformity of the backlight module decreases by 0.02, and the TCO vertical viewing angle uniformity decreases by 0.04. The top angle of the dimming part of the prism sheet decreases by 10 degrees, the TCO horizontal viewing angle uniformity decreases by 0.05 to 0.2, and the TCO vertical viewing angle uniformity decreases by 0.2. When the dimming period of the prism sheet changes by 10 microns, the horizontal and vertical viewing angle uniformity of TCO both increase by 0.01. When the top angle of the prism sheet is rounded, the curvature of the top angle changes, which will increase the horizontal and vertical viewing angle uniformity of TCO. According to the above simulation test results, the refractive index of the dimming part of the prism sheet, the haze of the prism sheet, and the top angle of the dimming part have significant improvements on the TCO viewing angle uniformity, while the changes in the dimming period and the curvature of the top angle have little effect on the TCO viewing angle uniformity.

[0118] Fig. 9 Schematic diagram of the effect of the refractive index of the dimming part of the prism on the viewing angle. Fig. 9 As shown in FIG. 1 , the refractive index of the dimming part of the prism sheet has a great influence on both the viewing angle and the brightness. The main influence of the refractive index on the shape of the optical viewing angle distribution is that it can cause the highlight area to shrink, such as Fig. 9 Therefore, in general, the higher the refractive index, the worse the viewing angle uniformity of the TCO.

[0119] Fig.10 Schematic diagram of the effect of the haze of the prism on the viewing angle. Fig.10 As shown, the haze appears as sharpness in the full viewing angle diagram, that is, the smoothness of the transition. When the haze of the prism increases, the brightness of the high-brightness area will be reduced, but the overall viewing angle distribution shape will not change, which is equivalent to the grayscale of the highlight area becoming lighter as a whole, and the brightness is distributed to the low-brightness area.

[0120] Fig.11 This is a graph showing how the haze of a prism sheet affects the viewing angle. Fig.11 In the curve graph shown, the horizontal axis is the horizontal viewing angle, and the vertical axis is the brightness, in nits. Curve K11 represents the horizontal viewing angle brightness curve with a haze of 0%, curve K12 represents the horizontal viewing angle brightness curve with a haze of 7%, curve K13 represents the horizontal viewing angle brightness curve with a haze of 20%, and curve K14 represents the horizontal viewing angle brightness curve with a haze of 30%. Fig.11 It can be seen that when the horizontal viewing angle is 17.17 degrees and 40.22 degrees, as the haze increases, the brightness decreases, and when the horizontal viewing angle is 17.17 degrees, as the haze increases, the brightness decreases faster, which makes the TCO viewing angle uniformity better.

[0121] Fig.12 This is a full-view distribution diagram of brightness after the first prism and the second prism of the dimming component are rotated simultaneously. In this example, taking the first cutting angle of the first prism as 0 degrees and the second cutting angle of the second prism as 0 degrees as an example, the first prism and the second prism are simultaneously rotated counterclockwise from 0 degrees to 180 degrees around the horizontal line (i.e., the third direction). During the rotation process, the angle between the extension direction of the first dimming part of the first prism (i.e., the first direction) and the extension direction of the second dimming part of the second prism (i.e., the second direction) is 0 degrees. Fig.12 It can be seen that the shape of the full viewing angle distribution remains unchanged and only rotates by the corresponding angle.

[0122] Fig.13 The 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 around the horizontal line in a counterclockwise direction. 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. Fig.13 It can be seen that the first central axis of the full viewing angle distribution shape ( Fig.13 The dashed line with an arrow in the middle) will rotate by the corresponding angle.

[0123] Fig.14This 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. Fig.14 It can be seen that the two ends of the second central axis direction of the full viewing angle distribution shape ( Fig.14 The medium-bright area encircled by the middle dotted circle will rotate by a corresponding angle and gradually become darker as the rotation angle increases.

[0124] Depend on Figure 12 to Figure 14 It can be seen from the full-viewing angle distribution diagram of the brightness that the first central axis direction of the full-viewing angle distribution shape depends on the first cutting angle of the first prism sheet, and the brightness of the two ends of the second central axis direction of the full-viewing angle distribution shape is related to the angle between the first prism sheet and the second prism sheet (i.e., the angle between the extension direction of the first dimming part of the first prism sheet and the extension direction of the second dimming part of the second prism sheet). It can be seen that the first cutting angle of the first prism sheet and the angle between the first prism sheet and the second prism sheet will affect the uniformity of the TCO viewing angle.

[0125] The following is a study of the variation of TCO viewing angle uniformity by taking the first cutting angle of the first prism sheet as 0 degrees and rotating the second prism sheet in the clockwise direction and the counterclockwise direction respectively. The angle between the first prism sheet and the second prism sheet mentioned 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).

[0126] Fig.15A This is a curve diagram of the change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated clockwise. Fig. 15B This is a curve diagram of the change in TCO vertical viewing angle uniformity after the second prism sheet is rotated clockwise. Fig.16A This is a curve diagram of the change in TCO horizontal viewing angle uniformity after the second prism sheet is rotated counterclockwise. Fig. 16B This is a curve diagram of the change in TCO vertical viewing angle uniformity after the second prism sheet is rotated counterclockwise.

[0127] FIG. 15A to FIG. 16B The horizontal axis in 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 part) and the horizontal line after the first prism sheet with a first cutting angle of 0 degrees is rotated. It can be equivalent to the first cutting angle of the first prism sheet when the third direction is parallel to the horizontal line. Fig.15A and Fig.16AThe vertical axis in represents the TCO horizontal viewing angle uniformity. Fig. 15B and Fig. 16B The ordinate in represents the TCO vertical viewing angle uniformity.

[0128] exist Fig.15A In the figure, 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.

[0129] exist Fig. 15B In the figure, 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.

[0130] exist Fig.16A In the figure, 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.

[0131] exist Fig. 16B In the figure, 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.

[0132] from FIG. 15A to FIG. 16B It can be seen that when the angle between the first prism sheet and the second prism sheet is 0 degrees, the best TCO horizontal viewing angle uniformity corresponds to two rotation positions of the first prism sheet, one of which is when the rotation angle of the first prism sheet is 30 degrees and 210 degrees, and the other is when the rotation angle of the first prism sheet is 150 degrees and 330 degrees. When the angle between the first prism sheet and the second prism sheet is greater than 0 degrees, when the second prism sheet rotates clockwise, the best TCO horizontal viewing angle uniformity corresponds to a rotation position of the first prism sheet, which is near the rotation angle of the first prism sheet is 30 degrees and 210 degrees. When the angle between the first prism sheet and the second prism sheet is greater than 0 degrees, when the second prism sheet rotates counterclockwise, the best TCO horizontal viewing angle uniformity corresponds to a rotation position of the first prism sheet, which is near the rotation angle of the first prism sheet is 150 degrees and 330 degrees. It can be seen that when the first cutting angle of the first prism sheet is 30 degrees or -30 degrees, the best TCO horizontal viewing angle uniformity can be obtained.

[0133] Fig.17A This is a curve diagram showing how the TCO viewing angle uniformity changes with the rotation angle of the second prism sheet. Fig. 17B is a curve diagram showing the change in brightness as the angle between the first prism sheet and the second prism sheet changes. Fig.17A The horizontal axis in is the rotation angle of the second prism sheet, Fig.17A The vertical axis in is the TCO viewing angle uniformity. Fig. 17B The horizontal axis in is the angle between the first prism sheet and the second prism sheet. Fig. 17B The vertical axis is brightness, in nits.

[0134] Fig.17AThe curve K61 in the figure represents the TCO horizontal viewing angle uniformity change curve after the first prism sheet is rotated clockwise at a first cutting angle of 30 degrees. The curve K62 represents the TCO horizontal viewing angle uniformity change curve after the first prism sheet is rotated counterclockwise at a first cutting angle of 150 degrees (i.e. -30 degrees). The curve K63 represents the TCO vertical viewing angle uniformity change curve after the first prism sheet is rotated clockwise at a first cutting angle of 30 degrees. The curve K64 represents the TCO vertical viewing angle uniformity change curve after the first prism sheet is rotated counterclockwise at a first cutting angle of 150 degrees.

[0135] Depend on Fig.17A It can be seen that when the angle between the first prism sheet and the second prism sheet is about 70 degrees, the TCO horizontal viewing angle uniformity and the TCO vertical viewing angle uniformity are both good. Fig. 17B It can be seen that the brightness is maximum when the angle between the first prism sheet and the second prism sheet is about 90 degrees, and the brightness gradually decreases as the angle decreases from 40 degrees to 90 degrees.

[0136] Combined with the above analysis of the effects of the refractive index and haze of the prism on viewing angle, as well as the effect of the angle between the dual prisms, it can be seen that by increasing the refractive index of the dimming parts of the first prism and the second prism, the uniformity of the TCO viewing angle can be reduced and the brightness can be increased; by increasing the haze of the first prism and the second prism, the uniformity of the TCO viewing angle can be reduced and the brightness can be reduced; by selecting a prism 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 uniformity of the TCO viewing angle.

[0137] Fig.18 is a brightness distribution diagram at all viewing angles combined with the included 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. Fig.18 As shown, 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.

[0138] According to the above analysis and tests, the absolute value range of the first cutting angle of the first prism can be 20 degrees to 40 degrees, such as 25 degrees to 33 degrees, for example, the first cutting angle can be about 30 degrees or -30 degrees. The absolute value range of the second cutting angle of the second prism can be 50 degrees to 90 degrees, such as 65 degrees to 80 degrees. The angle between the first prism and the second prism can be designed by setting the cutting angles of the first prism and the second prism, for example, the angle range between the two can be 65 degrees to 75 degrees, such as the angle between the two can be about 70 degrees, so as to achieve the requirements of both viewing angle and brightness. Among them, when the second cutting angle of the second prism is lower than 65 degrees, the brightness loss is serious; when the second cutting angle of the second prism is higher than 80 degrees, the uniformity of the TCO viewing angle cannot be achieved. The range setting of the cutting angles of the first prism and the second prism in this example can take into account the requirements of viewing angle and brightness.

[0139] According to the above analysis and tests, the higher the refractive index of the dimming part of the prism sheet, the higher the brightness and the better the uniformity of the TCO viewing angle. However, when the refractive index of the dimming part is greater than 1.6, the scratch resistance of the prism sheet decreases significantly. The refractive index of the dimming part of the prism sheet in this example can range from 1.45 to 1.7, for example, it can range from 1.5 to 1.6. Under the condition that the first prism sheet and the second prism sheet have appropriate cutting angles, the refractive index can be fully utilized to meet the brightness and viewing angle requirements.

[0140] According to the above analysis and tests, the haze of the first prism can range from 10% to 45%, for example, from 15% to 30%. When the haze of the first prism is less than 15%, the shielding property is poor. When the haze of the first prism is greater than 30%, the brightness loss is obvious. The haze of the second prism can range from 10% to 45%. For example, it can range from 25% to 45%. When the haze of the second prism is lower than 25%, the TCO viewing angle uniformity cannot be achieved. When the haze of the second prism is higher than 45%, the brightness loss is obvious. Under the condition that the first prism and the second prism have appropriate cutting angles, the haze can be fully utilized to meet the brightness and viewing angle requirements.

[0141] Fig.19 is another schematic diagram of a dimming component according to at least one embodiment of the present disclosure. Fig.19As shown, the dimming component may include: a stacked second prism sheet 12, a first prism sheet 11, and a reflective polarized brightness enhancement film (DBEF, Dual Brightness Enhancement Film) 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 is located on the light-emitting side of the first prism sheet 11. By providing the DBEF, light loss can be reduced and brightness gain can be increased. The description of the first prism sheet 11 and the second prism sheet 12 can refer to the description of the aforementioned embodiment, so it will not be repeated here.

[0142] Fig. 20 is a schematic diagram of a display device according to at least one embodiment of the present disclosure. Fig. 20 As shown, 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 the display device of this example have the advantages of small thickness, high gain and wide viewing angle.

[0143] In some examples, such as Fig. 20 As shown, the liquid crystal panel 20 may mainly include: an array substrate, a cell substrate, and a liquid crystal layer located between the array substrate and the cell substrate. The types of the liquid crystal panel 20 may include VA type, IPS type, TN type, etc. This embodiment is not limited to this.

[0144] In some examples, the display device can be a mobile device, such as a smart phone, a tablet computer, a laptop computer, etc., the display device can be a wearable terminal, such as a smart watch, a smart bracelet, smart glasses, an augmented reality device, etc., and the display device can be a fixed terminal, such as a desktop computer, a television, etc.

[0145] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures can refer to the usual design. In the absence of conflict, the embodiments of the present disclosure, i.e., 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 implementation without departing from the scope of the present disclosure.

Claims

1. A dimming component, characterized in that: include: 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, 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 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 relative to each other, and the third surface is located on a 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; an 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, characterized in that: 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, characterized in that: The angle between the first direction and the second direction ranges from 65 degrees to 75 degrees.

4. The dimming component according to claim 1, characterized in that: 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, characterized in that: The difference between the absolute value of the second cutting angle and the absolute value of the first cutting angle ranges from 10 degrees to 70 degrees.

6. The dimming component according to claim 4, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The first dimming portion of the first prism sheet has two first extending surfaces extending along the first direction, and in a cross section perpendicular to the second surface and perpendicular to the first direction, an angle between the two first extending surfaces ranges from 87 degrees to 92 degrees.

13. The dimming component according to claim 12, characterized in that: 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.

14. The dimming component according to claim 1, characterized in that: The dimming component further includes a diffusion sheet, which 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.

15. The dimming component according to claim 1, characterized in that: 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.

16. A backlight module, characterized in that: The invention comprises a light source component and a dimming component as claimed in any one of claims 1 to 15, wherein the light source component is configured to generate light directed toward the dimming component.

17. A display device, characterized in that: It comprises the backlight module as claimed in claim 16 and a liquid crystal panel located on the light emitting side of the backlight module.

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