Dodging assembly, backlight module and display device

Abstract

The utility model provides a dodging assembly, a backlight module and a display device. The dodging assembly comprises a dodging element, the dodging element is provided with a first end and a second end which are oppositely arranged, the cross section area of the first end is smaller than that of the second end, and the first end is close to a light-emitting surface of a light-emitting element of the backlight module; the multiple supporting columns are arranged at the first end of the light uniformizing element in a protruding mode, the distance between the protruding ends of the multiple supporting columns and the end face of the first end is configured to be a preset distance, and the thermal expansion coefficient of the supporting columns is smaller than that of the light uniformizing element. According to the invention, the problems of color temperature rise, divergence angle change and light emitting efficiency reduction caused by contact can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light uniformization assembly, a backlight module and a display device. BACKGROUND

[0002] The backlight module is widely used in various display devices such as televisions, monitors, notebook computers, mobile phones, etc. For example, the backlight module can be applied to a liquid crystal display device to provide a light source for the liquid crystal. At present, most of the designs of the backlight module utilize light uniformization elements / collimation assemblies, lenses and other elements for collimation and light uniformization to improve brightness and uniformity. However, after thermal expansion and deformation of the light uniformization element, the light uniformization element will contact the light emitting element, thereby causing problems such as color temperature rise, diffusion angle change, light efficiency change, and even high-temperature burning of the light uniformization element. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a light uniformization assembly, a backlight module and a display device, which helps to solve the problems of color temperature rise and light efficiency reduction caused by thermal deformation of the light uniformization element. The various aspects involved in the present application are introduced below.

[0004] In a first aspect, the present application provides a light uniformization assembly, comprising: a light uniformization element having a first end and a second end arranged oppositely, a cross-sectional area of the first end being less than or equal to a cross-sectional area of the second end, the first end being adjacent to a light emitting surface of a light emitting element of the backlight module; a plurality of support columns protruding from the first end of the light uniformization element, and a distance between protruding ends of the plurality of support columns and an end face of the first end being configured as a preset interval, a thermal expansion coefficient of the support columns being less than a thermal expansion coefficient of the light uniformization element.

[0005] In a second aspect, the present application provides a backlight module, comprising: a circuit board provided with a plurality of light emitting elements arranged in an array; a plurality of light uniformization elements, the plurality of light uniformization elements being arranged one-to-one corresponding to the plurality of light emitting elements, and any light uniformization element comprising a first end and a second end arranged oppositely, a cross-sectional area of the first end being less than a cross-sectional area of the second end, the first end being adjacent to the light emitting element; a light-transmitting substrate arranged at the second end of the plurality of light uniformization elements; a plurality of lenses arranged at a side of the light-transmitting substrate away from the light uniformization elements, and the plurality of lenses corresponding one-to-one to end faces of the second ends of the plurality of light uniformization elements, a geometric center of any lens being located on an optical axis of the corresponding light emitting element; and a limiting device arranged between the plurality of light uniformization elements and the plurality of light emitting elements, for preventing the first end of part or all of the plurality of light uniformization elements from contacting the corresponding light emitting element.

[0006] In a second aspect, the present application provides a display device, comprising the backlight module according to the second aspect and a display assembly, wherein the display assembly is arranged on the light exit path of the plurality of lenses of the backlight module.

[0007] In the embodiment of the present application, a plurality of supports are arranged at the light entrance end of the light homogenizing element. After thermal expansion and deformation of the light homogenizing element, the plurality of supports can limit the contact between the light homogenizing element and the light emitting element, thereby avoiding the problems of color temperature rise, diffusion angle change and light output efficiency reduction caused by the contact. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments of the present application will be briefly introduced.

[0009] Figure 1 FIG. 1 is a schematic diagram of the principle of a floating display of an LCD display screen.

[0010] Figure 2 FIG. 3 is a schematic diagram of the principle of a typical AR-HUD based on TFT-LCD.

[0011] Figure 3 FIG. 4 is a schematic diagram of the principle of a typical projector system based on TFT-LCD liquid crystal light valve.

[0012] Figure 4 FIG. 5 is a schematic diagram of the irradiance after collimation processing of LED light emission using a total reflection lens array.

[0013] Figure 5 FIG. 6 is a schematic diagram of the structure of a backlight module provided by the related art.

[0014] Figure 6 FIG. 7 is a schematic diagram of the structure of a light homogenizing assembly provided by the embodiment of the present application.

[0015] Figure 7 FIG. 8 is a possible cross-sectional schematic diagram of the light homogenizing element shown in FIG. 7. Figure 6

[0016] FIG. 9 is a schematic diagram of the structure of a backlight module provided by the embodiment of the present application. Figure 8

[0017] FIG. 10 is a partial enlarged schematic diagram of a sub light source shown in FIG. 9. Figure 9 Figure 8 FIG. 11 is a schematic diagram of the illuminance distribution of the lens array of the backlight module shown in FIG. 9 at a distance of 31 mm.

[0018] Figure 10a Figure 8 FIG. 12 is a schematic diagram of the illuminance distribution of the lens array of the backlight module shown in FIG. 9 at a distance of 31 mm.

[0019] Figure 10b FIG. 13 is a schematic diagram of the illuminance distribution of the lens array of the backlight module shown in FIG. 9 at a distance of 31 mm. Figure 8 ​​Intensity angle distribution diagram of the backlight module.

[0020] Figure 11 is Figure 8 Local dimming light source coupled with the LED of the backlight module.

[0021] Figure 12 is a schematic diagram of a component unit / partial component unit of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. The same or similar reference signs are used to represent the same or similar modules in the drawings. It should be understood that the drawings are only schematic, and the scope of protection of the present application is not limited thereto.

[0023] First, the application scenarios and related technical terms involved in the embodiments of the present application are introduced.

[0024] In the field of projection technology, a backlight module is applied to various display devices, for example, the backlight module can be applied to a liquid crystal display device. Since the liquid crystal display device itself does not emit light, it needs a backlight module to provide light for the liquid crystal. The backlight module, also known as a backlight source, is widely used in the fields of television, display, notebook computer, mobile phone, etc. in cooperation with a thin film transistor liquid crystal display (TFT-LCD). A direct type backlight source can also realize regional dimming, and a local dimming algorithm can be used to realize high dynamic range (HDR). However, this type of application is usually indoor direct viewing, and the brightness requirement is usually below 1000 nit, and the viewing angle requirement is large, usually more than 90 degrees. If the brightness of the LCD screen is required to be much higher than 1000 nit, the power consumption will be high and the heat will be serious, and the transmittance of the TFT-LCD display screen at high temperature decreases, and the reliability decreases.

[0025] In actual application, there are also some non-direct viewing display application scenarios, which are described below by way of example.

[0026] (I) Non-direct viewing display application scenario

[0027] Figure 1 is a schematic diagram of a principle of realizing floating display of an LCD display screen. As shown in Figure 1As shown, the LCD display is reflected by the windshield to form a virtual image. The curvature of the windshield is very small, and the imaging effect is similar to that of a mirror. The windshield, also known as the windshield, is transparent glass with a single-side reflectivity of less than 15%. If the reflectivity is increased by relying on double-side reflection, ghosting problems will occur. Due to the limited light output brightness of the LCD display screen, relying on traditional technology to achieve 5000 nit light emission, after reflection by the glass with a reflectivity of 15%, the eye brightness is only 750 nit. This has the problem of too low brightness in sunny daytime, that is, the display effect is greatly affected by the ambient light. The industry usually uses the blackened area at the bottom of the windshield for reflective display. The blackened area cannot transmit light and has no requirement for high transmittance, so a special reflective film can be used to enhance the reflectivity to increase the eye brightness. Moreover, the blackened area blocks most of the ambient light from the outside of the vehicle, so that the contrast of the display is maintained, reducing the requirement for eye brightness. Even if the blackened area is used and a reflective film with high reflectivity is used, the reflectivity of the reflective film cannot be too high (usually below 40%), otherwise the windshield will have strong mirror effect and some unnecessary virtual images will appear. The development goal of the floating display is not to use the blackened area, but to use the transparent windshield area for imaging. Therefore, the requirement for eye brightness is at least 10,000 nit, and if the corresponding transparent windshield reflectivity is 15%, the TFT-LCD display brightness is required to be more than 60,000 nit, which is far beyond the level that can be achieved by the existing technology. Therefore, it is necessary to realize a backlight source with higher brightness, and in order to improve the reliability of the LCD display screen under the vehicle standard working condition and under the sunlight, it is necessary to reduce the power consumption of the backlight source as much as possible.

[0028] Figure 2 A typical principle diagram of a head-up display based on TFT-LCD. The head-up display (head up display, HUD) is also called a heads-up display system, which is a center for vehicle drivers, blind operation, and multifunctional instrument panel. Figure 2 The head-up display is an augmented reality head-up display (augmented reality HUD, AR-HUD) with very wide application. For example, Figure 2As shown, the liquid crystal imaging unit is a picture generation unit (PGU), which is based on a high-brightness backlight source cooperating with a liquid crystal screen (such as a TFT-LCD), and then forming an enlarged virtual image through an enlarged light path, and the virtual image is reflected into the eye through the windshield, wherein the enlarged light path is usually two free-form mirrors used in cooperation. Generally, the AR-HUD requires an eye entrance brightness of 12,000 nit or more, and after passing through the optical components such as the enlarged light path, the brightness of the liquid crystal imaging unit will be lost, and the transmission efficiency is about 70%. Assuming that the reflectivity of the windshield is about 20%, it can be calculated that the brightness requirement of the liquid crystal imaging unit is above 85,000 nit. The AR-HUD based on the liquid crystal imaging unit also has the problem of sunlight backflow. The mechanism of sunlight backflow is: in sunny weather, sunlight in a certain direction will penetrate the windshield, pass through the two free-form mirrors in Figure 2 , and converge to the surface of the liquid crystal screen of the liquid crystal imaging unit, so that the local temperature of the surface of the liquid crystal screen rises sharply, and irreversible damage effect occurs. This is similar to the phenomenon that a magnifying glass can focus sunlight to ignite paper. If the brightness and power consumption of the backlight source are too high, the temperature of the liquid crystal screen itself is too high, and the sunlight backflow effect and the high-temperature environment required by the vehicle standard, the reliability of the liquid crystal imaging unit is difficult to guarantee.

[0029] Figure 3 is a typical projection system principle schematic diagram based on TFT-LCD liquid crystal light valve. As shown in Figure 3As shown, the high-brightness backlight illuminates a TFT-LCD liquid crystal light valve in a telecentric illumination form, and then through a Fresnel field lens and a projection lens realizes non-telecentric imaging to the screen to form a real image. Assuming that a 4.45-inch liquid crystal light valve is used, the transmittance efficiency of the Fresnel field lens and the projection lens is 80%, the numerical aperture of the telecentric illumination and the lens is F / 2.4, that is, the half-angle is about 12 degrees. If there is 400 lumens (lm) of light flux on the screen, the liquid crystal light valve emits 500 lm, and assuming that the liquid crystal emission is uniform in the half-angle of 12 degrees, the liquid crystal brightness can be calculated according to L = φ / πAsin2θ. Where L is the emission brightness of the liquid crystal light valve, A is the area of the 4.45-inch liquid crystal light valve (98.5 mm x 55.4 mm), and θ is the half-angle. Calculation can obtain the emission brightness L = 674,708 nit. It can be seen that the brightness requirement far exceeds the level that can be reached by the prior art, resulting in a very high working temperature of the liquid crystal light valve. Sometimes, in order to improve the light emission of the projector, the temperature can be close to the clearing point temperature of the liquid crystal material. The transmittance of the liquid crystal light valve usually decreases with the increase of temperature. In order to ensure the transmittance and reliability of the liquid crystal light valve, a fan is usually used for forced convection cooling, and even a thermo-electric cooler (TEC) is used to cool the liquid crystal light valve. Therefore, the temperature of the liquid crystal light valve needs to be kept from being too high to ensure its high transmittance and high reliability.

[0030] Because the observer is mainly the driver and the passenger in the vehicle, Figure 1 The viewing angle of the floating display in the vehicle does not have to be as large as that of the traditional direct-view display. The space in the vehicle is limited, so the required viewing angle half-angle is less than 45 degrees. Figure 2 The overall volume of the AR-HUD in the vehicle limits the size of the free-form mirror, so the viewing angle half-angle of the liquid crystal imaging unit is usually less than 20 degrees. Figure 3 The emission angle of the liquid crystal light valve in the projection system in the vehicle is usually about 12 degrees, which is limited by the design difficulty, lens size and cost of the projection lens.

[0031] The emission angle of the existing backlight is large, and if it is used in the above-mentioned occasions, most of the large-angle light cannot be utilized, resulting in low efficiency and difficulty in improving brightness, which is not suitable for high-brightness and low-power consumption occasions. One idea is to collimate the large-angle LED emission through optical devices, but if a simple total reflection lens array is used to collimate the emission of each LED, although high brightness can be achieved, the brightness uniformity is poor, such as Figure 4Another idea is to homogenize the backlight by adding a scattering film, which can improve part of the uniformity, but at the expense of brightness. It is very difficult to achieve high brightness homogenization of the array backlight under the premise of using only weak scattering film. Most of the prior art uses very strong transmissive scattering film and Lambertian reflector to expand the light emitting angle of the backlight to achieve acceptable uniformity.

[0032] (ii) Contrast

[0033] In a display system, the contrast is divided into inter-frame contrast (also known as sequential contrast) and intra-frame contrast. In a projection system, a system using a high-brightness light source with a digital micro-mirror device (DMD), LCD, liquid crystal on silicon (LCOS) light valve, and lens magnification, the light source brightness can be synchronized with the frame by global dimming, and a high inter-frame contrast can be achieved. However, if a local part of a frame needs to display high brightness, the entire light source cannot be dimmed in this frame, resulting in the failure of global dimming, unless all pixels in this frame are very dark. The intra-frame contrast can ensure higher contrast regardless of the video content. The problem that plagues intra-frame contrast is mainly the light leakage of the light valve when it is off, resulting in insufficient darkness in the dark area. An array-arranged local dimming backlight combined with a liquid crystal light valve can achieve a darker dark area and higher intra-frame contrast.

[0034] The human eye can adapt to a dynamic range of brightness of up to 10 14 orders of magnitude. An active light-emitting device such as an organic light-emitting semiconductor (OLED) can achieve a dynamic range of brightness close to 10 6 orders of magnitude. However, the maximum brightness of a display device is usually low, generally less than 1000 nit for an OLED TV and less than 5000 nit for a micro-display OLED. Using a backlight with a light valve, the brightness range achieved is only 10 3 orders of magnitude. The method to improve the dynamic contrast is either to use an array local dimming light source to reduce the brightness of the dark area as mentioned above, but in actual application scenarios, there will always be environmental light affecting the minimum brightness. The other method is to increase the maximum brightness, but the light valve is limited by heat dissipation and reliability, and cannot significantly increase the brightness of the light source, so the maximum brightness of the display is limited.

[0035] In Figure 3 a projector, low contrast will appear in a dark picture position, similar to a hazy state, affecting the detail display of the low gray area of the video, resulting in a poor viewing experience. In Figure 1 and Figure 2In the vehicle-mounted application, low contrast can cause the entire display picture to be highlighted in the dark area, forming a postcard effect, which affects the observation of the road by the human eye. This phenomenon has a greater impact on night driving and is harmful to driving.

[0036] Most of the existing products use collimating components, lenses and other elements to collimate and homogenize light in order to improve brightness and uniformity. Figure 5 is a structural diagram of a backlight module provided by the related art. As shown in Figure 5 The backlight module 500 includes a plurality of light emitting elements, a plurality of light homogenizing elements, and a light shielding unit.

[0037] The light emitting element can be an LED light emitting chip, and the plurality of light emitting elements and the plurality of light homogenizing elements are arranged one-to-one. The light homogenizing element is used to collimate and homogenize the light emitted by the light emitting element, or is called a collimating component. The light homogenizing element can be in the form of a cone rod. A light shielding unit is provided between the two adjacent light emitting elements to prevent crosstalk between the adjacent light emitting elements. The light homogenizing element can be optical silicone. Compared with common polymer materials, silicone material is more resistant to high temperature and yellowing. The coefficient of thermal expansion of silicone material is high, usually 250ppm, which is 5 times the coefficient of thermal expansion of polycarbonate (PC). After thermal deformation, the light homogenizing element will expand and contact the light emitting element, which will cause problems such as color temperature rise, diffusion angle change, and light efficiency change. Even the phenomenon of high-temperature burning of the light homogenizing element may occur.

[0038] Therefore, it is necessary to design a technical scheme of a backlight module with stable performance of diffusion angle and light efficiency after thermal deformation of the light homogenizing element.

[0039] Based on this, the embodiment of the present application proposes a light homogenizing assembly applied to a backlight module. The light homogenizing assembly will be described in detail below. Figure 6 The light homogenizing assembly of the embodiment of the present application is described in detail. As shown in Figure 6 The light homogenizing assembly 600 of the embodiment of the present application can include a light homogenizing element 620 and a plurality of support columns 610.

[0040] The light homogenizing element 620 has oppositely arranged first and second ends, and the cross-sectional area of the first end is less than or equal to that of the second end. The first end is adjacent to the light emitting surface of a light emitting element of the backlight module. Alternatively, the end face of the first end is the light entrance face 621, and the end face of the second end is the light exit face 622. Usually, the area of the light entrance face 621 is less than that of the corresponding light exit face 622.

[0041] The light uniformity element 620 can be made of poly methyl methacrylate (PMMA), polycarbonate (PC), glass, optical silica gel, or the like. As an example, optical silica gel is resistant to high temperature and yellowing, and thus can be used to make the light uniformity element 620. However, the coefficient of thermal expansion of silica gel is 5 times that of PC.

[0042] The plurality of protrusions 610 are protrudedly arranged at the first end of the light uniformity element 620, and the distance between the protruding end of the plurality of protrusions 610 and the end face of the first end is configured as a preset interval. The plurality of protrusions 610 are used to prevent the end face of the first end of the light uniformity element 620 from contacting the corresponding light emitting element. The coefficient of thermal expansion of the protrusions 610 is less than that of the light uniformity element 620. The preset interval can be, for example, 0.5-3 mm.

[0043] The plurality of protrusions 610 keep a gap between the light entrance face 621 of the light uniformity element 620 and the light emitting face of the light emitting element, and no contact occurs. In this way, after the light uniformity element 620 is deformed due to thermal expansion, it can be limited to contact the light emitting element, thereby avoiding the problems of color temperature rise, diffusion angle change, and light output efficiency reduction caused by contact.

[0044] Different types of light emitting elements (such as LED chips) have different light emitting angles, and a fixed preset interval cannot guarantee that all the light emitted by the light emitting element can enter the light entrance face of the light uniformity element 620.

[0045] Table 1

[0046] Light emitting element type Pre-set distance Type 1 Distance 1 Type 2 Distance 2 Type 3 Distance 3

[0047] In some implementations, the distance between the protruding end of the plurality of protrusions 610 and the end face of the first end is adjustable, and the preset interval is determined based on the type of the light emitting element. The mapping relationship between the type of the light emitting element and the preset interval can be as shown in Table 1. If the light emitting element belongs to type 1, the preset interval is interval 1. By adjusting the distance between the protruding end of the protrusions 610 and the end face of the first end, the distance between the light entrance face 621 of the light uniformity element 620 and the light emitting element can be adjusted, so that the light uniformity element 620 can adapt to different types of light emitting elements, and all the light emitted by the light emitting element can enter the light entrance of the light uniformity element 620, which helps to improve the brightness.

[0048] If the center of the light uniformity element 620 deviates from the center of the light emitting element greatly, the collimation and brightness of the light will be significantly reduced, so the alignment of the center of the light uniformity element 620 and the light emitting element is also crucial. In some implementations, the light emitting element side of the backlight module is provided with a plurality of positioning holes corresponding to the plurality of supports. When the plurality of supports 610 are in the corresponding plurality of positioning holes, the geometric center of the end face of the first end of the light uniformity element 620 on the normal projection point of the light emitting surface coincides with the geometric center point of the light emitting surface. That is, the support 610 also has the effect of centering, and the light emitting element is provided with a plurality of positioning holes corresponding to the supports around the light emitting element. By positioning through the support 610, the light uniformity element 620 can be ensured to be centered with the light emitting element during assembly and in the working state, which helps to improve the uniformity.

[0049] In some embodiments, the light uniformity element 620 is a cone rod type, and the cone rod can be a multi-prism structure or a circular prism structure. For example, the cone rod is a quadrangular prism structure or a pentagonal prism structure. The quadrangular prism structure is also called a trapezoidal body, and a cuboid is also a special trapezoidal body, that is, the upper and lower surfaces are the same, and the geometric center line of the upper and lower surfaces is perpendicular to the trapezoidal body.

[0050] The cone rod can be a hollow structure, Figure 7 is Figure 6 A possible cross-sectional view of the light uniformity element is shown. As Figure 7 shown, the hollow cone rod 860 can be defined by the inner wall 623, the light emitting surface 622, and the light incident surface 621. The inner wall 623 can be provided with a reflective film, which can be a film layer formed of a material with reflective function. By arranging the reflective film on the inner wall 623, when the incident light enters the interior from the light incident surface 621, the light beam that hits the inner wall 623 is reflected back into the cone rod 860 by the reflective film. This can prevent part of the light beam from being transmitted through the inner wall 623, so that more light beams are emitted from the light emitting surface 622 through the cone rod 860, which helps to improve the intensity of the emitted light beam. Since the angles of the light beams reflected back into the cone rod 860 are diverse, the light uniformity of the cone rod 860 can be improved.

[0051] In some embodiments, the plurality of supports are located on a first circle, and are uniformly distributed on the first circle. The first circle is a circle with the geometric center of the first end face as the center, that is, the plurality of supports 610 are uniformly distributed with respect to the light incident surface 621 of the light uniformity element 620. When the plurality of supports 610 are in contact with the light emitting element, it helps to make the plurality of supports 610 bear force uniformly, reduce the amount of shape change of the light uniformity element 620, and reduce the influence of the shape change on the diffusion angle of the light and the light emitting efficiency.

[0052] In some implementations, if the cone rod is a multi-ribbed structure, the plurality of struts are respectively located on the plurality of edges of the multi-ribbed structure. The edge is the joint of two adjacent sides, which is a position with higher strength in the multi-ribbed structure. The struts 610 are arranged on the edge, which helps to reduce the shape change amount of the light uniformization element 620 caused by the pressure of the struts 610, and further reduces the influence on the diffusion angle of light and the light efficiency.

[0053] In the embodiments of the present application, a plurality of struts 610 are arranged at the light entrance end of the light uniformization element 620. After the light uniformization element 620 is deformed due to thermal expansion, the plurality of struts 610 can limit the contact between the light uniformization element 620 and the light-emitting element, thereby avoiding the problems of color temperature rise, diffusion angle change, and light efficiency reduction caused by the contact.

[0054] The embodiments of the present application provide a backlight module. The following will Figure 8 The backlight module of the embodiments of the present application will be described in detail. As shown in Figure 8 The backlight module 800 of the embodiments of the present application can include a circuit board 810, a plurality of light uniformization elements 620, a light-transmitting substrate 830, a plurality of lenses 840, and a limiting device 850.

[0055] The circuit board 810 is provided with a plurality of light-emitting elements 811 arranged in an array. The light-emitting element 811 is used to emit a light beam, and can be a bulb, a light-emitting diode (LED), or an OLED. The plurality of light-emitting elements 811 can be arranged in an array, for example, in a circular array, a rectangular array, a circular array, an elliptical array, or other shaped arrays.

[0056] Each light-emitting element 811 can include a light-emitting surface, which can be a plane, a curved surface, or other shaped surface. To facilitate close arrangement, the outer contour of the light-emitting element 811 is usually rectangular, but can also be circular, other graphics, etc. In some embodiments, the light-emitting surfaces of all light-emitting elements 811 can be planes, for example, rectangles, and the light-emitting surfaces of all light-emitting elements 811 are kept flush. In other embodiments, the light-emitting surfaces of all light-emitting elements 811 can also not be kept flush. In the embodiments of the present application, the direction perpendicular to the light-emitting surface of the light-emitting element 811 is defined as the optical axis direction of the light-emitting element 811, that is, Figure 8 the X direction shown in FIG. 1.

[0057] The plurality of light uniformization elements 620 are arranged one by one corresponding to the plurality of light-emitting elements 811, and any light uniformization element 620 includes opposite first and second ends. The first end is adjacent to the light-emitting element 811, and the cross-sectional area of the first end is less than or equal to that of the second end, that is, the light uniformization element 620 is a gradually expanding structure. As Figure 6As shown, the end face of the first end is the light-incident surface 621, and the end face of the second end is the light-exiting surface 622. Usually, the area of ​​the light-incident surface 621 is smaller than the area of ​​its corresponding light-exiting surface 622.

[0058] It is understood that there is a gap between the end face (i.e., the light incident surface 621) of the first end of the light-diffusing element 620 and the light-emitting element 811, for example, it can be 0.5-3mm, and this embodiment of the application does not limit this. In this way, the light emitted from each light-emitting element 811 can not only enter the corresponding light-diffusing element 620, but also partially enter other adjacent light-diffusing elements, thereby improving the utilization rate of light and improving the light efficiency and light intensity.

[0059] In some implementations, the multiple light-diffusing elements 620 have identical specifications, such as the same length, meaning the distance between the end faces of the first and second ends of each light-diffusing element 620 is equal. Furthermore, the end faces of the second ends of the multiple light-diffusing elements 620 can be located on the same plane, and the end faces of the first ends of the multiple light-diffusing elements 620 can also be located on the same plane. The shape and area of ​​the light-incident surfaces 621 of the multiple light-diffusing elements 620 are identical, and the shape and area of ​​the light-exit surfaces 622 of the multiple light-diffusing elements 620 are also identical. In other implementations, the shape and area of ​​the end faces of the first and second ends of the light-diffusing elements 620 may be unequal, or partially equal.

[0060] In some implementations, the light-diffusing element 620 can be in the form of a cone, a square, or a frustum.

[0061] In some implementations, such as Figure 7 As shown, the area of ​​the light-incident surface 621 of the cone-shaped rod 860 can be larger than the area of ​​the light-emitting surface of the light-emitting element 811. The contour of the light-incident surface 621 of the cone-shaped rod 860 can match the contour of the light-emitting surface of the light-emitting element 811. Preferably, when the contour of the light-emitting surface of the light-emitting element 811 is rectangular, the cone-shaped rod 860 has a frustum structure, so that the contour of the light-incident surface 621 matches the contour of the light-emitting surface of the light-emitting element 811, and the cone-shaped rod 860 can accommodate the light-emitting surface of the light-emitting element 811 with the smallest contour area. In other embodiments, the area of ​​the light-incident surface 621 of the cone-shaped rod 860 can be less than or equal to the area of ​​the light-emitting surface of the light-emitting element 811.

[0062] A light-transmitting substrate 830 is disposed at the second end of a plurality of light-diffusing elements 620, specifically at the end face of the second end of the plurality of light-diffusing elements 620. The light-transmitting substrate 830 is light-transmitting and can be separately structured or integrally formed with the plurality of light-diffusing elements 620. Typically, the light-transmitting substrate 830 is made of a material with high hardness. In one specific embodiment, the light-transmitting substrate 830 and the plurality of light-diffusing elements 620 can be made of the same or different materials, and the light-transmitting substrate 830 can be connected to the end face of the second end of the plurality of light-diffusing elements 620, for example, by adhesive bonding. In another specific embodiment, the light-transmitting substrate 830 and the plurality of light-diffusing elements 620 (such as conical rods) can be made of the same material, and the light-transmitting substrate 830 and the plurality of light-diffusing elements 620 are formed by integral bonding.

[0063] Multiple lenses 840 are disposed on the side of the light-transmitting substrate 830 away from the light-diffusing element 620, and each lens 840 corresponds to one end face of the second end of the light-diffusing element 620. The geometric center of each lens 840 is located on the optical axis of the corresponding light-emitting element 811. The lenses 840 are used to converge the light emitted from the light-diffusing element 620, control the divergence angle of the light beam, and improve brightness.

[0064] The interface between lens 840 and light-transmitting substrate 830 is the light-incident side, such as... Figure 9 As shown, the light-incident side of lens 840 is a flat surface facing the light-exiting surface 622 of the light-diffusing element 620, while the light-exiting side of lens 840 is a curved surface. The material of lens 840 and the material of light-diffusing element 620 can be the same or different.

[0065] In Fresnel lenses, neglecting Fresnel losses at the interfaces between different optical media, approximately 19% stray light is present in the lens spot. Limited by the actual manufacturing process of Fresnel lenses, their actual efficiency is far lower than the designed efficiency. Lens manufacturing processes are relatively mature, and stray light is almost nonexistent in the lens spot. Therefore, the embodiments of this application... Figure 9 The scheme of cone-bar array + lens array has better light extraction efficiency.

[0066] Multiple light-emitting elements 811 are arranged in an array, multiple light-diffusing elements 620 are arranged in a corresponding array, and multiple lenses 840 are arranged in a corresponding array, forming a light source comprising multiple sub-light sources arranged in arrays. It can be understood that a light-emitting element 811, a single light-diffusing element 620, and a corresponding lens 840 are arranged coaxially in sequence to form a sub-light source.

[0067] Taking the light-diffusing element 620 as a cone rod as an example, such as Figure 9As shown, in actual use, the light emitting elements 811 emit light rays with large angles of divergence which are in-coupled into the plurality of the tapered rods 860 from the light ray in-coupling entrance of the tapered rod array, and the collimated light rays are emitted from the light ray exit of the lens array. Specifically, each light emitting element 811 emits light rays with large angles of divergence which enter into the corresponding tapered rod 860. The light in-coupling surface 621 of the tapered rod 860 can be arranged in parallel with the light emitting surface of the light emitting element 811, and the outer contour of the light in-coupling surface 621 is larger than that of the light emitting surface of the light emitting element 811. This allows the light beams emitted from the light emitting surface of the light emitting element 811 to be fully incident on the light in-coupling surface 621. The light beams are reflected several times in the tapered rod 860 and then exit from the light out-coupling surface 622 into the lens 840 behind the light-transmitting substrate 830. The backlight module 800 can collimate and homogenize the light beams by arranging the tapered rods 860, which helps to make the brightness of the light beams uniform.

[0068] The limiting device 850 is arranged between the plurality of the light homogenizing elements 620 and the plurality of the light emitting elements 811, and is used to prevent the first end of some or all of the light homogenizing elements 620 from contacting the corresponding light emitting elements 811.

[0069] For example, the limiting device 850 keeps a gap between the light in-coupling surface 621 of the light homogenizing element 620 and the light emitting surface of the light emitting element 811, and no contact occurs. In this way, after the light homogenizing element 620 thermally expands and deforms, it is limited from contacting the light emitting element 811, thereby avoiding the problems of color temperature rising, divergence angle changing, and light out-coupling efficiency reducing caused by the contact.

[0070] In some embodiments, the limiting device 850 can be arranged on the side of the plurality of the light homogenizing elements 620, specifically, on the first end of the plurality of the light homogenizing elements 620. The side of the light homogenizing element 620 is a mechanical structure, which is convenient for arrangement and design.

[0071] In some embodiments, as shown, Figure 9 The limiting device 850 can include a plurality of the support columns 610. The plurality of the support columns 610 are arranged protruding on the first end of the first light homogenizing element, and the distance between the protruding end of the plurality of the support columns 610 and the end surface of the first end of the first light homogenizing element is configured as a preset interval. The first light homogenizing element is any one of the plurality of the light homogenizing elements 620, and the thermal expansion coefficient of the support column 610 is smaller than that of the light homogenizing element 620. The plurality of the support columns 610 are used to prevent the end surface of the first end of the light homogenizing element 620 from contacting the corresponding light emitting element 811. The preset interval can be, for example, 0.5-3 mm.

[0072] Multiple support pillars 610 maintain a gap between the light-incident surface 621 of the light-diffusing element 620 and the light-emitting surface of the light-emitting element 811, preventing them from contacting each other. In this way, after the light-diffusing element 620 undergoes thermal expansion and deformation, it can limit its contact with the light-emitting element, thereby avoiding problems such as increased color temperature, changes in diffusion angle, and reduced light extraction efficiency caused by contact.

[0073] If the center deviation between the homogenizing element 620 and the light-emitting element is large, the collimation and brightness of the light will be significantly reduced. In some implementations, the first light-emitting element is the light-emitting element corresponding to the first homogenizing element among multiple light-emitting elements 811, and the first light-emitting element has multiple positioning holes corresponding to the multiple support pillars 610. When the multiple support pillars 610 are positioned in the corresponding multiple positioning holes, the geometric center of the end face of the first end of the first homogenizing element is projected onto the light-emitting surface of the first light-emitting element, and the geometric center of the light-emitting surface of the light-emitting element coincides with the geometric center of the light-emitting surface of the light-emitting element. That is, the support pillars 610 also have a center alignment function. By positioning with the support pillars 610, the homogenizing element 620 can be kept aligned with the center of the light-emitting element during assembly and operation, which helps to improve uniformity.

[0074] In some implementations, the preset spacing is determined based on the type of light-emitting element, and the distance between the protruding ends of the multiple pillars 610 and the end face of the first end is adjustable. By adjusting the distance between the protruding ends of the pillars 610 and the end face of the first end, the spacing between the light-incident surface 621 of the light-diffusing element 620 and the light-emitting element can be adjusted. This allows the light-diffusing element 620 to adapt to different types of light-emitting elements, ensuring that all light emitted by the light-emitting element can enter the light-incident port of the light-diffusing element 620, which helps to improve brightness.

[0075] In some specific embodiments, the cone rod 860 can be a frustum or a truncated cone structure. Multiple support pillars 610 have multiple orthographic projection points on the first end face of the cone rod 860 located on a first circumference and are evenly distributed on the first circumference. The first circumference is a circle centered on the geometric center of the first end face. That is, the multiple support pillars 610 are evenly distributed about the light-incident surface 621 of the cone rod 860. When the multiple support pillars 610 contact the light-emitting element 811, it helps to distribute the force evenly on the multiple support pillars 610, reducing the amount of shape change of the cone rod 860 and reducing the impact of the shape change of the cone rod on the light diffusion angle and light extraction efficiency.

[0076] In some specific embodiments, if the cone rod 860 is a multi-faceted structure, then the multiple supports 610 are respectively located on multiple edges of the multi-faceted structure. The edges are the joints of adjacent two sides and are the positions with higher strength in the multi-faceted structure. The supports 610 are set on the edges, which helps to reduce the amount of shape change of the cone rod 860 caused by the pressure on the supports 610, thereby avoiding changes in the light diffusion angle and light extraction efficiency.

[0077] Optionally, if the shape of the light emitting element 811 is rectangular, and the conical rod 860 is a quadrangular prism structure, the plurality of supports 610 are respectively located on the edges of the quadrangular prism structure.

[0078] In some specific embodiments, the number of the plurality of supports 610 can be 2, which is simple in structure and helps to reduce the heat of the light emitting element 811 transferred through the supports 610.

[0079] Taking any sub light source unit as an example, wherein the light emitting surface of the light emitting element 811 is rectangular, and the light homogenizing element 620 is a conical rod with a quadrangular prism structure. As shown in Figure 9 the limiting device 850 can include 2 supports 610. The 2 supports 610 are arranged at the first end of the first conical rod, and the protruding end of any support 610 is located between the end surface of the first end of the first conical rod and the light emitting element 811. Wherein the first conical rod is any conical rod in the plurality of conical rods 860. The 2 supports 610 are both located on the edges of the quadrangular prism conical rod and symmetrically distributed about the geometric center of the first end surface. When the conical rod 860 is thermally expanded and deformed, the front end surface of the support 610 protruding from the light incident surface of the conical rod 860 first contacts the light emitting surface of the light emitting element 811, and under the retention of the rigidity of the support 610, the light incident surface of the conical rod 860 after thermal expansion and deformation is limited to contact the light emitting surface of the light emitting element 811.

[0080] It can be understood that the expansion coefficient of the material of the support 610 is much smaller than the expansion coefficient of the conical rod 860, and at the same temperature, the thermal deformation amount of the support 610 is much smaller than the deformation amount of the conical rod 860. The expansion coefficient of the material of the support 610 can be lower than a preset expansion coefficient, which can be 3×10 -6 / ℃ for example. The thermal conductivity coefficient of the support 610 should be lower than a preset thermal conductivity coefficient, which can be 0.1 W / (m·K) for example. Or the support 610 is a heat insulation material, even if the support 610 contacts the light emitting surface of the light emitting element 811, it will not transfer the heat of the light emitting element 811 to the conical rod 860, which helps to reduce the thermal expansion and deformation amount of the conical rod 860.

[0081] In some implementations, the limiting device 850 can include a plurality of limiting elements in a multi-prism structure, the plurality of limiting elements corresponding to the plurality of light uniformizing elements, a thermal expansion coefficient of the limiting elements being less than a thermal expansion coefficient of the light uniformizing elements, the first limiting element being any one of the plurality of limiting elements, the first limiting element being any one of the plurality of limiting elements, the second light uniformizing element being a light uniformizing element corresponding to the first limiting element among the plurality of light uniformizing elements 620. If the light uniformizing element 620 is in a multi-prism structure, the first limiting element can be a corresponding hollow multi-prism structure; or if the light uniformizing element 620 is in a circular prism structure, the first limiting element can be a corresponding hollow circular prism structure. In some embodiments, one side end surface of the first limiting element is in abutment with an end surface of the first end of the second light uniformizing element, the other side end surface of the first limiting element is located between the end surface of the first end of the second light uniformizing element and the light emitting element, and the inner surface of the first limiting element is flush with the inner surface of the second light uniformizing element. This can ensure that the limiting element and the light uniformizing element reflect light uniformly and continuously. Optionally, a plurality of through holes can also be provided on the four peripheral side surfaces of the limiting element, which can enhance the heat insulation and heat dissipation effect. Optionally, the outer surface of the limiting element is flush with the outer surface of the light uniformizing element. Alternatively, in other embodiments, the first limiting element can be sleeved on the outside of the first end of the second light uniformizing element, which is simple and stable in assembly.

[0082] In some specific embodiments, a diffusing sheet can be arranged on the light exit side of the lens array. The diffusing sheet is used to further disperse the light exiting through the lenses 840, which helps to improve the uniformity of the light and avoid the light being too concentrated and not filling the corresponding pixel area at the rear end. The diffusing sheet is arranged on the side of the plurality of lenses 840 away from the light transmission substrate 830. Specifically, the diffusing sheet can have a gap with the lenses 840, and the gap is determined based on adjusting the focal length of the lenses 840. The gap can be, for example, 0.1-1 mm, which is not limited in the embodiments of the present application.

[0083] In the embodiments of the present application, a limiting device 850 (such as a support column) is arranged between the light uniformizing element 620 and the light emitting element 811. After the light uniformizing element 620 is deformed due to thermal expansion, the limiting device 850 can limit the light uniformizing element 620 from contacting the light emitting element 811, thereby avoiding the problems of color temperature rising, diffusion angle changing, and light output efficiency reducing caused by the contact.

[0084] The basic principle of local dimming is to divide the backlight (such as an LED) into a plurality of independently controlled blocks, and each block can independently adjust the brightness according to the display content requirements. This technology can reduce the brightness in areas that need to display deep black, and increase the brightness in areas that need to display bright details, thereby achieving better visual effects.

[0085] In the local dimming mode, each sub light source is responsible for the illumination of a display area independently, and the crosstalk between them is less. In the case that all sub light sources work at the same power, a uniform illumination distribution can be formed on the illumination plane at the specified position. All sub light sources can continuously adjust the light power. The local dimming light source of the embodiment of the present application can realize uniform illumination and non-uniform illumination of regional brightness adjustment.

[0086] The cone rod 860 and the lens 840 can both homogenize the light, but the divergence angles of the light are different. Figure 10a is the intensity angular distribution of the backlight module shown in Figure 8 is the intensity angular distribution of the backlight module shown in Figure 10b is the intensity angular distribution of the backlight module shown in Figure 8 is the intensity angular distribution of the backlight module shown in Figure 10b is also a light divergence effect diagram. Figure 10a The backlight module in the figure is composed of a plurality of sub light sources in 14 rows and 8 columns. As shown in the figure, the local dimming light source is coupled with the LED, and the illumination distribution at a distance of 31 mm from the lens array is uniform, and the illumination reaches the 106 energy level. As shown in the intensity angular distribution of the figure, the light energy is concentrated within ± 9° of the optical axis. It can be seen that by setting the cone rod and the lens array, the light can be further homogenized, and the emission angle can be increased. By setting the limiting device, the stability of the performance of the backlight module can be improved. Figure 10a Figure 10b The backlight module in the figure is composed of a plurality of sub light sources in 14 rows and 8 columns. As shown in the figure, the local dimming light source is coupled with the LED, and the illumination distribution at a distance of 31 mm from the lens array is uniform, and the illumination reaches the 106 energy level. As shown in the intensity angular distribution of the figure, the light energy is concentrated within ± 9° of the optical axis. It can be seen that by setting the cone rod and the lens array, the light can be further homogenized, and the emission angle can be increased. By setting the limiting device, the stability of the performance of the backlight module can be improved.

[0087] In the local dimming mode, the backlight module can reduce the input power of a single sub light source to realize the effect of reducing the local brightness. Figure 11 is the intensity angular distribution of the backlight module shown in Figure 8 is the intensity angular distribution of the backlight module shown in Figure 11 The light spot in the figure is composed of a 4x4 sub light source array, wherein the input light power of the sub light source (i.e. the light emitting element) in the 3rd row and the 1st column is reduced to 0, so the illumination at the corresponding position is rapidly reduced.

[0088] In the embodiment of the present application, a limiting device 850 is arranged between the cone rod 860 and the light emitting element 811. After the cone rod 860 is deformed due to thermal expansion, the limiting device 850 can limit the contact between the cone rod 860 and the light emitting element 811, thereby avoiding the problems of color temperature rise, diffusion angle change and light efficiency change caused by the contact.

[0089] ​The embodiment of the present application can further homogenize the light and increase the emission angle of the light by setting the cone rod and the lens array, set the limiting device to improve the stability of the performance of the backlight module, avoid the increase of color temperature and the change of diffusion angle. The embodiment of the present application can save the power consumption of the backlight module, reduce the heat load on the LCD light valve, and improve the inter-frame contrast and intra-frame contrast of the display. Since the heat load on the LCD light valve is significantly reduced, the maximum brightness of the backlight module can be appropriately increased, so that the maximum brightness of the display output is improved, which helps to improve the dynamic contrast (HDR). On this basis, since the maximum brightness of the LCD light valve is improved, the loss of the amplification light path can be increased. On the basis of achieving the same eye brightness, the loss of the backflowing sunlight is increased, and the heat load on the LCD light valve is reduced, which helps to effectively solve the problem of backflowing sunlight.

[0090] The embodiment of the present application also provides a display device 1200, which comprises the backlight module 800 and a display assembly 1210. The display assembly 1210 is arranged on the light path of the lens 840 of the backlight module 800. The display device 1200 can be a HUD auxiliary driving system, a liquid crystal display or other display equipment, etc. The HUD auxiliary driving system can map important information on the holographic half mirror on the windshield glass, so that the driver can see the important information without lowering his head, and the safety risk is reduced.

[0091] The backlight module 800 can provide a light source for the display assembly 1210, so that the display assembly 1210 can display a picture.

[0092] Those skilled in the art can understand that, Figure 12 The display device 1200 is only an example and does not constitute a limitation on the display device. More or fewer components than those shown can be included, or certain components can be combined or different components can be included.

[0093] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0094] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0095] In the embodiments provided in the present application, it should be understood that the disclosed apparatuses / devices and methods can be implemented in other manners. For example, the embodiments of the apparatus / device described above are merely schematic. For example, the division of the modules or units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0096] It should be understood that the term "comprising" as used in the specification and the appended claims indicates the presence of the recited features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0097] It should also be understood that the term "and / or" as used in the specification and the appended claims indicates any combination of one or more of the associated listed items and all possible combinations of the items.

[0098] As used in the specification and the appended claims, the term "if" can be interpreted as meaning "when" or "once" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if detected [the described condition or event]" can be interpreted as meaning "once determined" or "in response to a determination" or "once detected [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0099] In addition, in the description of the specification and the appended claims, the terms "first", "second", and the like are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A homogenizing assembly, characterized by, The application relates to a light homogenizing element and a backlight module. The light homogenizing element comprises a first end and a second end, the cross-sectional area of the first end is less than or equal to that of the second end, and the first end is adjacent to the light emitting surface of a light emitting element of a backlight module. A plurality of pillars are protrudingly arranged on the first end of the light homogenizing element, and the distance between the protruding ends of the pillars and the end face of the first end is configured as a preset interval, and the thermal expansion coefficient of the pillars is less than that of the light homogenizing element.

2. The light uniformization assembly of claim 1, wherein, The light emitting element side of the backlight module is provided with a plurality of positioning holes corresponding to the plurality of pillars, and when the plurality of pillars are in the corresponding plurality of positioning holes, the geometric center of the end face of the first end of the light homogenizing element is coincident with the geometric center of the light emitting surface of the light emitting element.

3. The light uniformization assembly of claim 1, wherein, The distance between the protruding ends of the plurality of pillars and the end face of the first end is adjustable, and the preset interval is determined based on the type of the light emitting element.

4. The light homogenizing assembly according to any one of claims 1 to 3, characterized in that The light homogenizing element is a cone rod, the cone rod is a multi-prism platform structure or a circular platform structure, the plurality of projection points of the plurality of pillars on the end face of the first end are located on a first circle, and are uniformly distributed on the first circle, and the first circle is a circle with the geometric center of the end face of the first end as the center.

5. The light homogenizing assembly of claim 4, wherein, If the cone rod is the multi-prism platform structure, the plurality of pillars are respectively located on a plurality of edges of the multi-prism platform structure.

6. A backlight module, characterized in that, The application relates to a backlight module. The backlight module comprises a circuit board provided with a plurality of light emitting elements arranged in an array, a plurality of light homogenizing elements corresponding to the plurality of light emitting elements, and a light-transmitting substrate provided with the second ends of the plurality of light homogenizing elements. A plurality of lenses are arranged on the side of the light-transmitting substrate away from the light homogenizing elements, and the plurality of lenses correspond to the end faces of the second ends of the plurality of light homogenizing elements, and the geometric center of any lens is located on the optical axis of the corresponding light emitting element. A limiting device is arranged between the plurality of light homogenizing elements and the plurality of light emitting elements, and is used for preventing the first ends of part or all of the plurality of light homogenizing elements from contacting the corresponding light emitting elements. The limiting device comprises a plurality of pillars protrudingly arranged on the first end of a first light homogenizing element, the distance between the protruding ends of the plurality of pillars and the end face of the first end of the first light homogenizing element is configured as a preset interval, the first light homogenizing element is any light homogenizing element in the plurality of light homogenizing elements, and the thermal expansion coefficient of the pillars is less than that of the light homogenizing element. ​ ​ 7. The backlight module of claim 6, wherein, ​ ​ 8. The backlight module of claim 7, wherein, The first light emitting element is a light emitting element corresponding to the first light homogenizing element in the plurality of light emitting elements, and the first light emitting element side is provided with a plurality of positioning holes corresponding to the plurality of supports, and when the plurality of supports are in the corresponding plurality of positioning holes, the geometric center of the end face of the first end of the first light homogenizing element coincides with the geometric center of the light emitting element.

9. The backlight module of claim 7, wherein, The distance between the protruding end of the plurality of supports and the end face of the first end is adjustable, and the preset interval is determined based on the type of the light emitting element.

10. The backlight module according to any one of claims 7-9, wherein, The plurality of light homogenizing elements are a plurality of conical rods, the conical rod is a polygonal frustum structure or a circular frustum structure, the plurality of projection points of the plurality of supports on the end face of the first end are located on a first circle, and are uniformly distributed on the first circle, and the first circle is a circle with the geometric center of the end face of the first end as the center.

11. The backlight module of claim 10, wherein, If the conical rod is a polygonal frustum structure, the plurality of supports are respectively located on a plurality of edges of the polygonal frustum structure.

12. The backlight module of claim 6, wherein, The plurality of light homogenizing elements are a polygonal frustum structure, the limiting device includes a plurality of limiting elements in a polygonal frustum structure, one side end face of a first limiting element is in abutment with the end face of the first end of a second light homogenizing element, the other side end face of the first limiting element is located between the end face of the first end of the second light homogenizing element and the light emitting element, and the inner surface of the first limiting element is flush with the inner surface of the second light homogenizing element, the first limiting element is any limiting element in the plurality of limiting elements, and the second light homogenizing element is a light homogenizing element corresponding to the first limiting element in the plurality of light homogenizing elements.

13. A display device comprising: The display assembly is provided on the light emitting path of the plurality of lenses of the backlight module.

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