Light control film and display device

Abstract

The invention discloses a light control film and a display device, and relates to the technical field of display. The light control film comprises a plurality of light absorption areas which are arranged in an array at intervals along a first direction according to a preset distance; the light-transmitting areas are arranged between the adjacent light-absorbing areas; the light reflecting structure is arranged on one side close to the light incident surface of the plurality of light absorbing areas; wherein the light reflecting structures are arranged in one-to-one correspondence with the plurality of light absorbing areas respectively, and the light reflecting structures reflect light rays directly irradiated to the light absorbing areas for reuse, so that the transmittance of the optical assembly is increased. According to the light control film, the problem that the light emitting efficiency of a backlight assembly provided with the light control film is low due to the fact that the transmittance of most of the light control films can only reach the level of 50-70% due to the design and process problems of the current light control film is solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a light control film and a display device. Background Art

[0002] With the development of displays, light control films are being developed to prevent the contents displayed on the displays from being disclosed to others. Due to design and process problems, the transmittance of most current light control films can only reach 50-70%, resulting in low light extraction efficiency of the backlight assembly equipped with the light control film. No effective solution has been proposed so far for the above-mentioned problems. Summary of the invention

[0003] Purpose of the invention: To provide a light control film and a display device to solve at least one of the problems existing in the above-mentioned prior art.

[0004] Technical solution: A light control film, comprising:

[0005] A plurality of light absorption regions are arranged in an array along a first direction at intervals of a preset distance;

[0006] a light-transmitting region disposed between adjacent light-absorbing regions; and

[0007] A reflective structure is arranged on a side of the light incident surface close to the light absorbing areas;

[0008] The reflective structures are respectively arranged in one-to-one correspondence with the plurality of light absorbing regions, and the reflective structures reflect the light directly incident on the light absorbing regions for reuse, so as to increase the transmittance of the optical component.

[0009] Preferably, the width of the reflective structure is not greater than the width of the light absorbing area.

[0010] Preferably, the width ratio of the light-transmitting area to the light-absorbing area is between 3:1 and 20:1.

[0011] Preferably, the ratio of the height to the width of the light absorption region is between 100:20 and 100:2.

[0012] Preferably, the width of the light absorption region is 2-20 μm, and the height of the light absorption region is 20-200 μm.

[0013] Preferably, the optical refractive index of the light-transmitting region is n1, and the optical refractive index of the light-absorbing region is n2;

[0014] Wherein, the relationship between the optical refractive index difference n1 and the optical refractive index difference n2 is n1-n2≥0.2.

[0015] Preferably, an adhesive layer is provided between the light absorbing area and the light reflecting structure;

[0016] Wherein, the adhesive layer is low-refractive index glue, the optical refractive index of the low-refractive index glue is n3, and satisfies the following relationship: n3≤n2.

[0017] Preferably, the optical refractive index of the reflective structure is n4, and satisfies the following relationship: n3≤n4≤n1.

[0018] Preferably, an air region not filled with any substance is provided between the light absorbing region and the light reflecting structure.

[0019] In order to achieve the above objective, according to another aspect of the present application, a display device is also provided.

[0020] The display device according to the present application includes the light control film as described above.

[0021] Beneficial effect: In the embodiment of the present application, a preset reflective structure is adopted, and the reflective structure is respectively arranged in one-to-one correspondence with the plurality of light absorbing areas. The reflective structure reflects the light directly incident on the light absorbing areas for reuse, so as to increase the transmittance of the optical component, thereby achieving the purpose of improving the utilization rate of light, thereby achieving the technical effect of increasing the transmittance of the optical film, and further solving the current light control film. Due to its design and process problems, most light control films have a transmittance of only 50-70%, resulting in a technical problem of low light output efficiency of the backlight assembly equipped with the light control film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the light control film of the present invention;

[0023] Figure 2 is another schematic diagram of a light control film of the present invention;

[0024] Figure 3 It is a simulation diagram of the optical effect of the light control film of the present invention;

[0025] Figure 4 is a schematic diagram of the reflective structure of the light control film of the present invention; and

[0026] Figure 5 It is a schematic diagram of the reflective structure of another light control film of the present invention.

[0027] The accompanying drawings are marked as follows:

[0028] 10. Light absorption area;

[0029] 20. Light-transmitting area;

[0030] 30. Reflective structure;

[0031] 40. Adhesive layer;

[0032] 50. Air zone. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] like Figure 1-5 As shown, the present application relates to a light control film and a display device. Figure 1-3 As shown, the light control film includes: a plurality of light absorption areas 10, which are arranged in an array at preset distances along a first direction; the light absorption area 10 refers to a light-shielding material or a light-absorbing material filled inside, such as black ink, etc., which can adjust the visible viewing angle of the light emission and control the emission viewing angle, thereby achieving an anti-peeping effect.

[0038] The first direction refers to the horizontal direction. By arranging a plurality of light absorbing regions 10 in an array at a preset distance along the horizontal direction, it is possible to precisely control the absorption, reflection or transmission behavior of light, and also to produce a specific optical effect through uniform distribution in space, such as uniform light transmittance or directional reflection.

[0039] The light absorption regions 10 are arranged in the form of an interval array along the first direction, and the absorption and distribution of light on the film surface are adjusted through different intervals and array forms to form a specific optical response. The arraying of the light absorption regions 10 helps to achieve more precise light control and avoid the local excessive light absorption or uneven light transmission phenomenon that may be caused by a single large area light absorption region 10.

[0040] The preset intervals ensure that light is evenly distributed over the entire film surface, preventing local areas from absorbing too much or too little light. By adjusting the intervals, the transmission, reflection or absorption of light of different wavelengths can be controlled to form an optical effect that meets specific needs. Accurately setting the intervals and sizes of the light absorption areas 10 helps to improve the overall efficiency of the light control film and reduce light energy loss.

[0041] It should be noted that the preset spacing can be set according to actual usage requirements and is not limited in this application.

[0042] The light-transmitting area 20 is arranged between several adjacent light-absorbing areas 10; by arranging the light-transmitting area 20 and the light-absorbing area 10 alternately, the transmission, absorption and reflection of light can be accurately controlled, thereby achieving a specific optical effect; for example: adjusting the intensity, distribution or directionality of light.

[0043] By arranging the light-transmitting area 20 between adjacent light-absorbing areas 10, the light-controlling film can achieve uniform light transmission in part or in whole, reduce shadows or local over-darkness, and is particularly suitable for scenes such as smart windows and optoelectronic display devices. The presence of the light-transmitting area 20 can improve the transparency of the light-controlling film, so that the film can automatically adjust the transparency under different lighting conditions to ensure comfortable light in the room.

[0044] The light-absorbing area 10 is responsible for absorbing or reflecting light of a specific wavelength, while the light-transmitting area 20 allows light to pass through. The combination of the two can effectively adjust the amount of light entering the system to form the desired optical effect; at the same time, by adopting an alternating arrangement, the light emission angle can be controlled to achieve a better anti-peeping viewing angle.

[0045] It should be noted that the ratio and spacing between the light-transmitting area 20 and the light-absorbing area 10 can be adjusted according to different application requirements, thereby achieving flexible control of light transmittance.

[0046] The reflective structure 30 is arranged on the light incident surface side close to the light absorption areas 10; by arranging the reflective structure 30 on the light incident surface side of the light absorption area 10, the light incident to the light absorption area can be reflected back, so as to be reused, thereby reducing light loss and enhancing light utilization, thereby optimizing light distribution and utilization;

[0047] The light is reflected back to the backlight module through the reflective structure 30, and then re-incident to the light control film through refraction and reflection, thereby improving the light utilization rate. That is, the light that was originally intended to be incident on the light absorption area is transformed into the light transmission area through the reflective structure after a series of reflections and refractions, thereby re-incident to the light absorption area.

[0048] The reflective structure 30 may be made of a highly reflective material, which can effectively reflect light and maintain the stability of the reflection direction.

[0049] It should be known that the light control film on the market includes a light output surface and a light input surface opposite thereto, and includes an optical layer with alternating absorption regions and transmission regions.

[0050] like Figure 4-5 As shown, the reflective structure 30 may be an isosceles triangular prism. More preferably, the reflective area may also be a quadrangular pyramid, a triangular pyramid, a cone or the like.

[0051] Of course, it can also be an isosceles triangular prism, and in this application, the shape is not limited.

[0052] The reflective structures 30 are respectively arranged in one-to-one correspondence with the plurality of light absorbing regions 10 , and the reflective structures 30 reflect the light directly incident on the light absorbing regions 10 for reuse, so as to increase the transmittance of the optical component.

[0053] Specifically, the reflective structures 30 are arranged one by one with the plurality of light absorption areas 10, and the light reuse efficiency is improved by reflecting the light directly incident on the light absorption area 10, thereby finally increasing the transmittance of the optical component. This can achieve accurate and effective management of light absorption, reflection and transmission, and optimize the performance of the optical system.

[0054] Each light absorption area 10 is equipped with an independent light reflecting structure 30, which can ensure that the light is reflected back to the backlight module by the light reflecting structure 30 before entering the light absorption area, and then re-enters the light transmission area, thereby improving the light utilization rate.

[0055] When light directly enters the light control film or optical component, the reflective structure 30 can effectively reflect part of the direct light back into the system, allowing it to re-enter the light absorption area 10 or the light transmission area 20; the light that was originally intended to enter the light absorption area can be reused to enhance the overall light transmittance.

[0056] Guided by the reflective structure 30, the light is reflected and reused multiple times in the system, which reduces the loss of light and significantly improves the light transmittance of the light-transmitting area 20. The reflective structure 30 optimizes the path of light so that more light can pass through the entire light control film or optical component, thereby improving the overall light efficiency of the system.

[0057] The present application proposes a light control film with high transmittance, in which a reflective structure area for secondary utilization of incident light is arranged on the light input surface, and the light that is about to be absorbed by the absorption area can be reflected back to the backlight module and reused to improve the overall transmittance of the optical component of the light control film.

[0058] The structure of the present invention can theoretically reflect light originally absorbed by the light absorption area and reuse it, which can reduce the absorption amount of the absorption area by at least 60%, thereby increasing the total transmittance by 5% to 15%.

[0059] From the above description, it can be seen that the present application achieves the following technical effects:

[0060] In the embodiment of the present application, a preset reflective structure 30 is adopted, and the reflective structure 30 is respectively arranged in a one-to-one correspondence with the plurality of light absorbing areas 10. The reflective structure 30 reflects the light directly incident on the light absorbing area 10 for reuse, so as to increase the transmittance of the optical component, thereby achieving the purpose of improving the light utilization rate, thereby achieving the technical effect of increasing the transmittance of the optical film, and further solving the current light control film. Due to its design and process problems, most light control films have a transmittance of only 50-70%, resulting in a technical problem of low light output efficiency of the backlight assembly equipped with the light control film.

[0061] Furthermore, the width of the reflective structure 30 is not greater than the width of the light absorbing area 10. It can be understood that by setting the width of the reflective structure 30 to be not greater than the width of the light absorbing area 10, that is, the width of the reflective structure 30 is less than or equal to the width of the light absorbing area 10, it is possible to not reflect the light in the transmission area, but only reflect the light incident to the light absorbing area, and reflect the light in the light absorbing area back for reuse.

[0062] Designing the reflective structure 30 to be no larger than the width of the light-absorbing area 10 can make the entire optical system more compact and orderly, which is conducive to miniaturization or lightweight design, especially in scenarios that require precise optical control; such as display devices, intelligent light control systems, etc. Ultimately, the light transmittance of the entire system is improved. Through reasonable width restrictions, the reflective structure 30 can be dynamically adjusted according to the needs of the optical components, thereby ensuring that light can be optimally utilized regardless of whether it is in strong light or weak light environments.

[0063] When the width of the reflective structure 30 matches the light absorbing area 10, the reflective material and shape can be further optimized; for example, a microstructure design with different reflection angles can be used to achieve a more efficient light utilization effect.

[0064] Therefore, the light control film of the present application is provided with a reflective structure, and the reflective structure area needs to be completely aligned with the light absorbing structure area. If the reflective structure area is aligned with the light transmitting area 20, the overall transmittance will be reduced; if the light absorbing structure area is not completely aligned, then the reflective structure area cannot achieve the desired effect.

[0065] Of course, if the light-absorbing material filled on the light-incident surface remains on the light-incident surface, it will also cause the transmittance of the product to decrease and reduce the reflection effect of the reflective structure area.

[0066] Furthermore, the width ratio of the light-transmitting area 20 to the light-absorbing area 10 is between 3:1 and 20:1. It is understandable that by adopting the above range, the light transmittance can be adjusted and a certain viewing angle anti-peeping effect can be achieved.

[0067] Specifically, the area of ​​the light-transmitting region 20 is 3 to 20 times that of the light-absorbing region 10. The larger light-transmitting region 20 ensures that light can pass through the system smoothly, while the light-absorbing region 10 is responsible for absorbing part of the light at the incident viewing angle.

[0068] Effective absorption of the light absorption zone 10: Although the light absorption zone 10 is small in area, through its position and specific absorption material or coating, the light absorption zone can absorb part of the light at a viewing angle and control the light emission viewing angle, thereby achieving the effect of viewing angle adjustment.

[0069] When a smaller ratio of 3:1 is used, the area difference between the light-transmitting area 20 and the light-absorbing area 10 is smaller, which is suitable for scenes with more precise light control; the light-absorbing area 10 can absorb more light, helping to reduce excess light or control specific light intensity in the system.

[0070] When a ratio of 20:1 is used, it is suitable for scenes that require more light to pass through but also require some light to be absorbed. The existence of the light absorption area 10 can still play a role in regulating the light, but the light transmission ability is stronger, which is suitable for applications with higher light intensity requirements.

[0071] The larger light-transmitting area 20 ensures that the optical component can allow more light to pass through, making it have a high light transmittance; although the light-absorbing area 10 is smaller in area, it can effectively absorb or filter the unwanted spectral range. It is very practical in situations where it is necessary to control light of a specific wavelength, such as infrared, ultraviolet or overly strong visible light.

[0072] The design of a large proportion of the light-transmitting area 20 can significantly improve the overall light transmittance of the optical system, allowing light to pass through the device more efficiently. Reduce light loss: By reasonably controlling the ratio of the light-transmitting area 20 and the light-absorbing area 10, high light transmittance and anti-peeping viewing angle can be achieved;

[0073] When the ratio of the light-transmitting area is large, the transmittance is high, but the black glue in the light-absorbing area is difficult to fill;

[0074] When the light transmission area ratio is small, the transmittance is low and the anti-peep angle is large.

[0075] Furthermore, the ratio of the height to the width of the light absorption region 10 is between 100:20 and 100:2. It can be understood that by setting the height-to-width ratio of the light absorption region 10 within the above range, the light absorption region 10 has a larger height and a narrower width, which can improve the light absorption efficiency and enhance the directional control of the light.

[0076] Specifically, the ratio of the height to the width of the light absorption zone 10 is 100:20 to 100:2. The height of the light absorption zone 10 is much greater than its width, ensuring that the light absorption zone 10 has sufficient contact surface on the light propagation path and can capture more incident light. At the same time, the narrower width helps to accurately control the lateral light absorption range of the light absorption zone 10 and avoid the entry of excessive scattered light.

[0077] When the ratio of 100:20 is adopted, at this wider ratio, the light absorption area 10 still has a certain lateral expansion, which is suitable for scenes that need to absorb light in a larger range; for example: environments that do not have high requirements for the incident angle.

[0078] When a ratio of 100:2 is used, the light absorption zone 10 is extremely narrow and can focus on absorbing light in a specific direction or angle, which is suitable for fine optical control, such as directional absorption of light paths and efficient capture of light energy.

[0079] Therefore, adopting the above ratio interval also has the following beneficial effects:

[0080] Height increases light contact area: Since the height of the light absorption region 10 is much greater than its width, this means that the light absorption region 10 has more opportunities to contact and absorb light on the light propagation path, which can improve the absorption efficiency, especially when the light is reflected or refracted multiple times.

[0081] Reducing lateral interference: The width limitation ensures that the light absorption area 10 mainly acts in the vertical direction of the light, reducing unnecessary lateral light interference, which is particularly suitable for devices requiring precise optical control.

[0082] Controlling the light absorption range: The narrow width enables the light absorption area 10 to absorb light from a specific direction without excessive diffusion to other areas. This is particularly critical for array optical systems and helps to improve the optical accuracy of the system.

[0083] Adapting to multiple reflection systems: In some optical systems, light will return to the light absorption area 10 after multiple reflections. A higher light absorption area 10 can ensure that more reflected light is captured, thereby improving the utilization rate of light energy.

[0084] Dynamic Light Control: Different height to width ratios can be used for different lighting scenarios. For example, a smaller width is suitable for systems that need to accurately absorb a single light path, while a larger ratio is suitable for situations that need to handle a wider range of light.

[0085] Integration of multiple optical functions: By controlling the height and width of the light absorbing area 10, it can be integrated with other optical structures (such as the light transmitting area 20 and the reflective structure) to form a complex light control system to achieve directional absorption, reflection and transmission of light.

[0086] Furthermore, the width of the light absorption region 10 is 2-20 μm, and the height of the light absorption region 10 is 20-200 μm. It is understandable that the width of the light absorption region 10 is set in the range of 2-20 μm, because the width range of the light absorption region 10 is small, it is ensured that the light absorption region 10 can efficiently concentrate light; when the width is small, light is easily absorbed and concentrated in a small range for energy conversion. This width range is particularly suitable for capturing small wavelength light and improving light absorption efficiency.

[0087] The height of the light absorption region 10 is set in the range of 20-200 μm. The height of the light absorption region 10 is relatively large relative to the width, which helps to increase the volume of the light absorption region 10, thereby increasing the light absorption depth; a higher light absorption structure can capture deeper light and avoid light scattering and loss after shallow absorption. Increasing the height also helps to enhance the stability of light absorption and reduce the reflection loss of light in the system.

[0088] Therefore, a smaller width design can effectively reduce the scattering of light outside the light absorption zone 10, so that the light absorption zone 10 can efficiently capture light and prevent excessive light from escaping; for light of different wavelengths, this width range can adjust the response of the light absorption zone 10 to light of different spectra.

[0089] A larger height range can enhance the multiple absorption effect of light, especially in an optical system. By increasing the depth of the light absorption region 10, more light is absorbed during the penetration process, thereby improving the overall absorption efficiency.

[0090] Of course, a higher height can be set according to usage requirements.

[0091] Furthermore, the optical refractive index of the light-transmitting region 20 is n1, and the optical refractive index of the light-absorbing region 10 is n2;

[0092] The relationship between the optical refractive index difference n1 and the optical refractive index difference n2 is n1-n2≥0.2. It is understood that by controlling the refractive index difference between the light-transmitting area 20 and the light-absorbing area 10, specific optical effects can be achieved, especially optimization in terms of refraction, reflection and absorption of light.

[0093] Specifically, the refractive index difference is at least 0.2, which means that the light-transmitting region 20 and the light-absorbing region 10 have obvious differences in optical properties.

[0094] When the refractive index n1 of the light-transmitting area 20 is higher, the refractive index of the light-transmitting area 20 is higher, which means that light can pass through this area more easily and the refraction of light is smaller when passing through.

[0095] When the refractive index n2 of the light absorption region 10 is low, the refractive index of the light absorption region 10 is relatively low, which means that when the region transmits light, more light may be absorbed or deflected, thereby reducing the light transmission.

[0096] The propagation behavior of light between the light-transmitting area 20 and the light-absorbing area 10 is controlled by the refractive index difference; a larger refractive index difference helps to ensure that light can be transmitted efficiently in the light-transmitting area 20, while being more absorbed or attenuated in the light-absorbing area 10; at the same time, in the case of a large refractive index difference, when light enters the light-absorbing area 10 from the light-transmitting area 20, a certain amount of reflection will occur and return to the light-transmitting area 20, so that the light energy can be reused, thereby enhancing the transmittance of the optical system.

[0097] The refractive index difference is large, n1-n2≥0.2: This difference can enhance the light separation effect; the light can be fully transmitted in the light-transmitting area 20, while the light-absorbing area 10 limits the transmission of light, enhancing the absorption or directional reflection effect of light. Specifically, the light energy of the light-transmitting area 20 can be maximized, while the light-absorbing area 10 can improve the system efficiency through optical absorption or reflection.

[0098] The larger refractive index difference can ensure that the energy flow of light between the light-transmitting area 20 and the light-absorbing area 10 is effectively controlled, so that the light energy can be better utilized, especially in the processing of multiple reflected light.

[0099] Of course, the greater the difference between the two, the better, as long as the material allows.

[0100] Furthermore, an adhesive layer 40 is provided between the light absorbing area 10 and the light reflecting structure 30;

[0101] The adhesive layer 40 is a low-refractive-index glue, and the optical refractive index of the low-refractive-index glue is n3, and satisfies the following relationship: n3≤n2. It can be understood that the adhesive layer 40 is located between the light-absorbing area 10 and the reflective structure 30, and plays the role of bonding and fixing the two areas; its optical properties have a direct impact on the optical performance of the system, especially on the propagation, reflection and absorption of light.

[0102] The function of the low refractive index glue n3 is to reduce the refraction loss of light between different media; when light enters the adhesive layer 40 from the light absorption area 10, if the refractive index of the glue is low, the refraction of the light will be gentler, thereby reducing energy loss and avoiding excessive reflection loss.

[0103] By satisfying the following relationship: n3≤n2, it means that the refractive index n3 of the adhesive layer 40 does not exceed the refractive index n2 of the light absorbing region 10, thereby preventing excessive refraction of light when passing through the adhesive layer 40 and maintaining the transmission efficiency of light.

[0104] Since n3 is small, the light will not be significantly deflected when passing through the adhesive layer 40, so that the light can enter the light absorption area 10 or the reflective structure more smoothly, thereby improving the overall optical efficiency.

[0105] On the contrary, if the refractive index of the adhesive layer 40 is too high, light will undergo greater refraction and reflection when passing between different media, resulting in light loss; by using low-refractive index glue n3, the reflection loss of light at the interface can be minimized, increasing the efficiency of light entering the light absorption area 10 and the reflective structure 30.

[0106] Due to the design of n3≤n2, light can be effectively transmitted between the light absorbing area 10 and the reflective structure 30 , and the low refractive index glue can ensure that the light will not be scattered excessively due to the difference in refractive index, thereby increasing the number of reflections of light in the system and improving the light transmittance of the light transmitting area 20 .

[0107] Preferably, the closer n3 is to vacuum, the better; of course, this area may be directly not filled with glue, thereby achieving an optimal vacuum refractive index of 1.0.

[0108] Furthermore, the optical refractive index of the reflective structure 30 is n4, and satisfies the following relationship: n3≤n4≤n1. It can be understood that ensuring the effective transmission of light between the light-transmitting area 20, the reflective structure 30 and the adhesive layer 40 reduces light loss and improves the optical efficiency of the system.

[0109] Specifically, n3≤n4 is adopted to ensure smooth transmission of light between the adhesive layer 40 and the reflective structure 30, and to avoid excessive refraction and light loss at the interface between the adhesive layer 40 and the reflective structure 30. Since the refractive index of n4 is higher than or equal to n3, the light is less refracted when entering the reflective structure 30 from the adhesive layer 40, ensuring that the light can be effectively reflected back into the system.

[0110] By adopting n4≤n1, the difference in refractive index between the reflective structure 30 and the light-transmitting area 20 is limited, so that the transmission of light from the reflective structure 30 to the light-transmitting area 20 is smoother; because n4 is not greater than n1, the light will not be refracted too much when entering the light-transmitting area 20 from the reflective structure 30, thereby reducing light dispersion and loss, ensuring that more light can enter the light-transmitting area 20, and improving light transmittance.

[0111] Therefore, by adopting the refractive index relationship of n3≤n4≤n1, the transmission and reflection efficiency of light between the light-transmitting area 20, the reflective structure 30 and the adhesive layer 40 can be optimized; the refractive index of the low-refractive index glue matches that of the reflective structure 30, thereby reducing the interface refraction loss; at the same time, the reasonable matching of the refractive index of the reflective structure 30 and the light-transmitting area 20 improves the transmittance of light and the overall optical performance of the system.

[0112] Preferably, n4=n1, and the greater the refractive index difference with n3, the better.

[0113] Furthermore, an air region 50 not filled with a substance is provided between the light absorbing region 10 and the light reflecting structure 30. It is understandable that, as a transparent medium, air has a relatively low optical refractive index (approximately 1.0), which is much lower than the refractive index of general materials; by providing the air region 50 between the light absorbing region 10 and the light reflecting structure 30, the reflection and transmission behavior of light can be optimized through the difference in refractive index between air and material.

[0114] The low refractive index of the air region 50 helps to change the propagation path of the light, reduce the loss of light at the interface of different structures, and enhance the reflection effect of the reflective structure 30. After passing through the light absorption region 10 and entering the air region 50, the light will encounter a significant change in the refractive index, causing part of the light to be reflected back to the light absorption region 10 or the reflective structure 30, further utilizing the light energy.

[0115] Furthermore, the vertex angle of the reflective structure 30 is 30°-120°. It is understandable that when the vertex angle is 30°, the smaller vertex angle helps to concentrate the incident light and form a focusing effect.

[0116] After the light is incident, it will be reflected back to the light-transmitting area 20 or other optical areas at a smaller reflection angle, which can enhance the concentrated reflection of the light, make the light energy of the system be concentrated and utilized, and increase the brightness of a specific area.

[0117] When the vertex angle is 120°, a larger vertex angle will disperse and reflect the light, expanding the coverage of the light; it is suitable for occasions where a wide distribution of light is required, such as lighting equipment or display backlight; it can make the incident light reflect at a wider angle, thereby dispersing the light in a larger range, which is suitable for scenes that require uniform light distribution. For example, it can be used in backlight modules to evenly disperse light and reduce dark areas.

[0118] Setting the vertex angle within the above range also has the following beneficial effects:

[0119] The top angle design of the reflective structure 30 directly affects the utilization rate of light. By guiding the reflected light to the light-transmitting area 20 again, the transmittance of the entire optical system can be effectively improved, so that the light in the system can be reflected and utilized more times, reducing light waste.

[0120] Different top angle designs enable the reflective structure 30 to adapt to various application requirements, achieving both efficient light focusing and providing a wide range of light distribution, thereby improving the efficiency and flexibility of the system.

[0121] Preferably, the top angle of the reflective structure 30 is 60°, 75° or 90°.

[0122] Specifically, when the top angle of the reflective structure 30 is 60°, the light can be appropriately gathered and the incident light can be reflected to a relatively concentrated area. Although it is not too narrow, it can ensure a certain reflection intensity. It is suitable for applications where light needs to be concentrated to a certain degree while maintaining uniform distribution; for example: some backlight modules or photovoltaic panels of a smaller area.

[0123] When the top angle of the reflective structure 30 is 75°, a better balance is provided in the reflective structure 30, which can achieve relatively uniform light reflection and retain a certain light concentration, so that the light can effectively cover a larger area without being too scattered. It is suitable for application scenarios that require uniform light reflection but also focus on reflection efficiency; for example: display backlight system, lighting fixtures.

[0124] When the top angle of the reflective structure 30 is 90°, the reflection angle will disperse the light widely, making the reflection path of the light close to a right angle, increasing the possibility of multiple reflections of the light in the system, thereby increasing the uniform distribution of light. It is suitable for scenes that require a wide range of light distribution, especially in large-area lighting, diffuse illumination and large-area backlight systems, where a 90° angle can provide a more uniform lighting effect.

[0125] The specific examples are further described below:

[0126] Example 1

[0127] like Figure 1 As shown, the width of the light absorption zone 10 is 2 μm, the height of the light absorption zone 10 is 100 μm, the ratio of the height to the width of the light absorption zone 10 is 100:2, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 20:1, the optical refractive index n1 of the light transmission zone 20 is 1.6, and the optical refractive index n2 of the light absorption zone 10 is 1.2; the optical refractive index n3 of the air zone 50 is 1, and the optical refractive index n4 of the reflective structure 30 is 1.5.

[0128] At this time, after testing, the performance parameters of the light control film are: the transmittance is 93%.

[0129] Example 2

[0130] like Figure 2 As shown, the difference between Example 2 and Example 1 is that an adhesive layer 40 is provided between the light absorbing area 10 and the light reflecting structure 30, and the optical refractive index n3 of the adhesive layer 40 is 1.3.

[0131] At this time, after testing, the performance parameters of the light control film are: the transmittance is 89%.

[0132] Example 3

[0133] The difference between Example 3 and Example 1 is that the width of the light absorption region 10 is 20 μm, the height of the light absorption region 10 is 200 μm, and the ratio of the height to the width of the light absorption region 10 is 200:20.

[0134] At this time, after testing, the performance parameters of the light control film are: the transmittance is 86%.

[0135] Example 4

[0136] The difference between Example 4 and Example 1 is that the width ratio of the light-transmitting region 20 to the light-absorbing region 10 is 3:1.

[0137] At this time, after testing, the performance parameters of the light control film are: the transmittance is 83%.

[0138] Example 5

[0139] The difference between Example 5 and Example 1 is that the width of the light absorption region 10 is 10 μm, the ratio of the height to the width of the light absorption region 10 is 100:10, the width ratio of the light transmission region 20 to the light absorption region 10 is 10:1, and the optical refractive index n2 of the light absorption region 10 is 1.3.

[0140] At this time, after testing, the performance parameters of the light control film are: the transmittance is 81%.

[0141] Example 6

[0142] The difference between Example 6 and Example 1 is that the width of the light absorption zone 10 is 5 μm, the height of the light absorption zone 10 is 50 μm, the ratio of the height to the width of the light absorption zone 10 is 100:10, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 5:1, the optical refractive index n1 of the light transmission zone 20 is 1.7, the optical refractive index n2 of the light absorption zone 10 is 1.4, and the optical refractive index n4 of the reflective structure 30 is 1.6.

[0143] At this time, after testing, the performance parameters of the light control film are: the transmittance is 87%.

[0144] Example 7

[0145] The difference between Example 7 and Example 1 is that the width of the light absorption zone 10 is 20 μm, the height of the light absorption zone 10 is 100 μm, the ratio of the height to the width of the light absorption zone 10 is 100:20, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 3:1, the optical refractive index n1 of the light transmission zone 20 is 1.5, and the optical refractive index n4 of the reflective structure 30 is 1.4.

[0146] At this time, after testing, the performance parameters of the light control film are: the transmittance is 80%.

[0147] Comparative Example 1

[0148] The difference between Comparative Example 1 and Example 1 is that the light absorption area 10 and the light reflecting structure 30 are not arranged correspondingly.

[0149] At this time, after testing, the performance parameters of the light control film are: the transmittance is 70%.

[0150] Comparative Example 2

[0151] The difference between Comparative Example 2 and Example 1 is that the optical refractive index n1 of the light-transmitting region 20 is 1.55, and the optical refractive index n2 of the light-absorbing region 10 is 1.45.

[0152] At this time, after testing, the performance parameter of the light control film is: the transmittance is 75%.

[0153] The results of various embodiments and comparative examples are shown in Table 1:

[0154]

[0155]

[0156] From the above test results we can see that:

[0157] 1. It can be seen from Examples 1-7 and Comparative Example 1 that the transmittance of the light control film is significantly improved by adopting the structure of the present application.

[0158] 2. It can be seen from Example 1 and Comparative Example 2 that, under the premise that other parameters remain unchanged, the refractive index difference between the light-transmitting area 20 and the light-absorbing area 10 is only 0.1, which is far below the requirement of 0.2; the smaller refractive index difference leads to low transmission efficiency of light between the light-transmitting area 20 and the light-absorbing area 10, and the light transmission performance of the system is reduced.

[0159] It should be noted that when the refractive index difference is large, the refraction loss of light between the light-transmitting region 20 and the light-absorbing region 10 is small.

[0160] 3. It can be seen from Examples 1 and 2 that, under the premise that other parameters remain unchanged, an air region 50 or an adhesive layer 40 is provided between the light absorbing region 10 and the light reflecting structure 30, respectively, and the transmittance changes significantly.

[0161] The present application also relates to a display device, including the light control film as described above. The basic principle and technical effect of the display device using the light control film provided in this embodiment are the same as those of the above embodiments. For parts not mentioned in this embodiment, please refer to the above corresponding contents. The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of equivalent transformations, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A light control film, characterized in that: include: A plurality of light absorbing regions (10) are arranged in an array along a first direction at intervals of a preset distance; A light-transmitting region (20) is disposed between a plurality of adjacent light-absorbing regions (10); and A light reflecting structure (30) is arranged on a light incident surface side close to the light absorbing regions (10); The reflective structures (30) are respectively arranged in one-to-one correspondence with a plurality of the light absorbing regions (10), and the reflective structures (30) reflect the light directly incident on the light absorbing regions (10) for reuse, thereby increasing the transmittance of the optical component.

2. The light control film according to claim 1, characterized in that The width of the light reflecting structure (30) is no greater than the width of the light absorbing region (10).

3. The light control film according to claim 1, characterized in that The width ratio of the light-transmitting region (20) to the light-absorbing region (10) is between 3:1 and 20:

1.

4. The light control film according to claim 1, characterized in that The ratio of the height to the width of the light absorption region (10) is between 100:20 and 100:

2.

5. The light control film according to claim 1, characterized in that The width of the light absorption region (10) is 2-20 μm, and the height of the light absorption region (10) is 20-200 μm.

6. The light control film according to claim 1, characterized in that The optical refractive index of the light-transmitting region (20) is n1, and the optical refractive index of the light-absorbing region (10) is n2; Wherein, the relationship between the optical refractive index difference n1 and the optical refractive index difference n2 is n1-n2≥0.

2.

7. The light control film according to claim 6, characterized in that An adhesive layer (40) is provided between the light absorbing area (10) and the light reflecting structure (30); Wherein, the adhesive layer (40) is low-refractive index glue, the optical refractive index of the low-refractive index glue is n3, and satisfies the following relationship: n3≤n2.

8. The light control film according to claim 7, characterized in that The optical refractive index of the reflective structure (30) is n4, and satisfies the following relationship: n3≤n4≤n1.

9. The light control film according to claim 1, characterized in that An air region (50) not filled with any substance is provided between the light absorbing region (10) and the light reflecting structure (30).

10. The light control film according to claim 1, characterized in that The top angle of the reflective structure (30) is 30°-120°.

11. A display device, characterized in that Comprising the light management film as claimed in any one of claims 1-10.

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