Display module and projection equipment

Abstract

A display module (200) of a projection device comprises: a light source assembly (220), the light source assembly (220) comprising a first substrate (221) and a plurality of light emitting units (222); the at least one light emitting unit (222) comprises an independently packaged light emitting device (2221) and a first dimming structure (2222) arranged on the light emitting side of the light emitting device (2221), and the first dimming structure (2222) is configured to narrow the light emitting angle (alpha) of the light emitting device (2221); the liquid crystal panel (210) is arranged on the light emitting side of the light source assembly (220); the second dimming structure (230) is arranged between the light source assembly (220) and the liquid crystal panel (210), and the second dimming structure (230) is configured to collimate light rays emitted by the first dimming structure (2222), so that at least part of the light rays emitted by the second dimming structure (230) are parallel light rays. The invention also provides projection equipment.

Description

Display modules and projection equipment Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module and a projection device. Background Art

[0002] Currently, liquid crystal projection devices on the market can be divided into single-LCD panel projection devices and multi-LCD panel projection devices according to the number of LCD panels used.

[0003] The light source component used in a single LCD panel projection device is a chip on board (COB) type light source component. The illumination uniformity of the chip on board type light source component is poor. To ensure the illumination uniformity, a larger light mixing distance is required, which in turn limits the size of the projection device, making it difficult to achieve integration and miniaturization of the single LCD panel projection device.

[0004] Summary of the Invention

[0005] In view of the above problems, the present disclosure provides a display module and a projection device.

[0006] According to a first aspect of the present disclosure, a display module of a projection device is provided, comprising:

[0007] A light source assembly comprising a first substrate and a plurality of light-emitting units; at least one light-emitting unit comprising an independently packaged light-emitting device and a first dimming structure disposed on a light-emitting side of the light-emitting device, wherein the first dimming structure is configured to narrow the light-emitting angle of the light-emitting device;

[0008] A liquid crystal panel disposed on the light-emitting side of the light source assembly;

[0009] A second dimming structure is provided between the light source assembly and the liquid crystal panel, and the second dimming structure is configured to collimate the light emitted from the first dimming structure so that at least part of the light emitted from the second dimming structure is parallel to each other.

[0010] According to an embodiment of the present disclosure, the first dimming structure includes a first columnar portion and a first lens, wherein the first lens is located on a side of the first columnar portion away from the light-emitting device;

[0011] The first lens includes a first curved surface protruding toward the second dimming structure, and the curvature of the first curved surface and the thickness of the first columnar portion are configured to narrow the light output angle of the light-emitting device from a first angle to a second angle, wherein the first angle includes an obtuse angle and the second angle includes an acute angle.

[0012] According to an embodiment of the present disclosure, the ratio of the first angle to the second angle is set to 8:1 to 8:3.

[0013] According to an embodiment of the present disclosure, the multiple light-emitting units are distributed in an array along the first direction and the second direction, there is a first spacing between two adjacent light-emitting devices along the first direction, and there is a second spacing between two adjacent light-emitting devices along the second direction, and at least one of the first spacing and the second spacing is less than or equal to the maximum spacing between the first curved surface and the light-emitting surface of the light-emitting device.

[0014] According to an embodiment of the present disclosure, the light emitting device includes a package support and a light emitting portion exposed by the package support;

[0015] The orthographic projection of the first dimming structure on the first substrate covers the orthographic projection of the light-emitting portion on the first substrate, and the orthographic projection of the packaging bracket on the first substrate covers the orthographic projection of the first dimming structure on the first substrate.

[0016] According to an embodiment of the present disclosure, the second dimming structure includes a plurality of second lenses, at least one of the second lenses is arranged opposite to at least one of the light-emitting units, and an orthographic projection of the at least one second lens on the first substrate covers an orthographic projection of the light-emitting unit on the first substrate.

[0017] At least one of the second lenses includes a second curved surface protruding toward the liquid crystal panel, and a curvature of the second curved surface is smaller than a curvature of the first curved surface.

[0018] According to an embodiment of the present disclosure, a ratio of a curvature of the first curved surface to a curvature of the second curved surface is 20:9 to 50:1.

[0019] According to an embodiment of the present disclosure, a refractive index of the first lens is smaller than a refractive index of the second lens.

[0020] According to an embodiment of the present disclosure, the second dimming structure includes a light incident surface and a light exit surface, and one of the light incident surface and the light exit surface is provided with at least one layer of anti-reflection film, and the orthographic projection of the anti-reflection film on the first substrate continuously covers the orthographic projection of the multiple second lenses on the first substrate.

[0021] According to an embodiment of the present disclosure, the maximum thickness of the second dimming structure is smaller than the maximum distance between the first curved surface and the light emitting surface of the light emitting device.

[0022] According to an embodiment of the present disclosure, a third distance is provided between the first substrate and the light incident surface of the second dimming structure, and a ratio of a thickness of the first substrate to the third distance is less than or equal to 1:15.

[0023] According to an embodiment of the present disclosure, an insulating glass is arranged between the second dimming structure and the liquid crystal panel, there is a fourth distance between the second dimming structure and the insulating glass, there is a fifth distance between the insulating glass and the liquid crystal panel, and the fifth distance is greater than the fourth distance.

[0024] According to an embodiment of the present disclosure, a ratio of the fourth interval to the fifth interval is set to 4:11 to 7:8.

[0025] According to an embodiment of the present disclosure, the maximum distance between the side of the light-emitting unit facing away from the first substrate and the light-emitting surface of the light-emitting device is greater than the fourth distance and smaller than the fifth distance.

[0026] According to an embodiment of the present disclosure, the light incident surface of the liquid crystal panel includes multiple light incident areas arranged in an array along the first direction and the second direction, and the illumination difference of the output light of the second dimming structure at the center of any two light incident areas is less than or equal to 20%.

[0027] According to an embodiment of the present disclosure, the multiple light-emitting units include multiple light-emitting unit groups, different light-emitting unit groups include different light-emitting units, at least one light-emitting unit group is electrically connected to the local backlight adjustment circuit through at least one first signal line, and different light-emitting unit groups are electrically connected to the local backlight adjustment circuit through different first signal lines.

[0028] According to an embodiment of the present disclosure, the light emitting area of ​​the light source assembly is greater than or equal to the display area of ​​the liquid crystal panel, and the difference between the light emitting area of ​​the light source assembly and the display area of ​​the liquid crystal panel is less than or equal to 10%.

[0029] According to a second aspect of the present disclosure, there is provided a projection device, comprising a display module, a reflector, and a lens;

[0030] The reflector is arranged between the display module and the lens, and the light emitted by the display module can be reflected into the lens through the reflector;

[0031] Wherein, the display module includes the above-mentioned display module.

[0032] According to an embodiment of the present disclosure, the projection device further includes a first sealed cavity and a first fan disposed in the first sealed cavity, and the second dimming structure and the liquid crystal panel are both located in the first sealed cavity;

[0033] The orthographic projection of any one of the second dimming structure and the liquid crystal panel on the bottom wall of the first sealed cavity does not overlap with the orthographic projection of the first fan on the bottom wall of the first sealed cavity;

[0034] The first fan includes a first air outlet and a first air inlet, the first air outlet is set toward a first area, the first area is located between the second dimming structure and the liquid crystal panel, the first air inlet and the first air outlet have different directions and are set toward at least one side inner wall of the first sealed cavity.

[0035] According to an embodiment of the present disclosure, the display module further includes a Fresnel lens assembly disposed on a side of the liquid crystal panel away from the second dimming structure, the second dimming structure and the bottom wall of the first sealed cavity forming an integral structure, and the Fresnel lens assembly and the top wall of the first sealed cavity forming an integral structure;

[0036] The first air inlet is arranged toward the top wall of the first sealed cavity, and an orthographic projection of the first air inlet on the bottom wall of the first sealed cavity does not overlap with an orthographic projection of the Fresnel lens assembly on the bottom wall of the first sealed cavity.

[0037] According to an embodiment of the present disclosure, the bottom wall of the first sealed cavity comprises a metal material, the display module further comprises a second fan and a vent, and the second fan and the vent are in communication with the outside of the projection device;

[0038] The second fan and the vent are arranged along a third direction, a first gap exists between the bottom wall of the first sealed cavity and the light source assembly, and the second fan and the vent are both connected to the first gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0040] FIG1 schematically shows a schematic diagram of a projection device in a pair of proportions;

[0041] FIG2 schematically shows a schematic diagram of a projection device according to an embodiment of the present disclosure;

[0042] FIG3 schematically shows a plan view of a liquid crystal panel according to an embodiment of the present disclosure;

[0043] FIG4 schematically shows a schematic diagram of a light emitting unit according to an embodiment of the present disclosure;

[0044] FIG5 schematically shows a schematic diagram of a second dimming structure according to an embodiment of the present disclosure;

[0045] FIG6 schematically shows a plan view of a light source assembly according to an embodiment of the present disclosure;

[0046] FIG7 schematically shows a plan view of four adjacent light-emitting units according to an embodiment of the present disclosure;

[0047] FIG8 schematically shows a plan view of a second dimming structure according to an embodiment of the present disclosure;

[0048] FIG9 schematically shows a schematic diagram of an antireflection film according to an embodiment of the present disclosure;

[0049] FIG10 schematically shows a schematic diagram of a heat-insulating glass according to an embodiment of the present disclosure;

[0050] FIG11 schematically shows a schematic diagram of a first projection according to an embodiment of the present disclosure;

[0051] FIG12 schematically shows a schematic diagram of an actual lighting area according to an embodiment of the present disclosure;

[0052] FIG13 schematically shows a schematic diagram of a projection device according to an embodiment of the present disclosure;

[0053] FIG14 schematically shows a schematic diagram of heat dissipation of a projection device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0055] It should be noted that in the drawings, the sizes and relative sizes of elements may be exaggerated for clarity and / or descriptive purposes. Thus, the sizes and relative sizes of the individual elements are not necessarily limited to those shown in the drawings. In the specification and drawings, the same or similar reference numerals indicate the same or similar parts.

[0056] When an element is described as being "on" another element, "connected to" another element, or "bound to" another element, the element may be directly on the other element, directly connected to the other element, or directly bound to the other element, or there may be an intermediate element. However, when an element is described as being "directly on" another element, "directly connected to" another element, or "directly bound to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between", "adjacent" versus "directly adjacent", or "on" versus "directly on", etc. In addition, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection. In addition, the X-axis, Y-axis, and Z-axis are not limited to the three axes of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, Y-axis, and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0057] It should be noted that although the terms "first," "second," etc. may be used herein to describe various parts, components, elements, regions, layers, and / or portions, these parts, components, elements, regions, layers, and / or portions should not be limited by these terms. Rather, these terms are used to distinguish one part, component, element, region, layer, and / or portion from another. Thus, for example, the first part, first member, first element, first region, first layer, and / or first portion discussed below may be referred to as a second part, second member, second element, second region, second layer, and / or second portion without departing from the teachings of the present disclosure.

[0058] For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," etc., may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features.

[0059] As used herein, the terms "substantially," "about," "approximately," "roughly," and other similar terms are used as terms of approximation rather than as terms of degree, and are intended to account for the inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. To account for factors such as process fluctuations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), "about" or "approximately" as used herein are inclusive of the stated value and mean within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0060] FIG1 schematically shows a diagram of a projection device in a pair of scales.

[0061] Referring to FIG. 1 , a pair of proportional figures shows a single-LCD panel projection device that utilizes a chip-on-board (COB) light source assembly 110. The COB light source assembly 110 includes a substrate 111 and a light-emitting unit 112. The substrate 111 may include a printed circuit board (PCB), and the light-emitting unit 112 may include a light-emitting diode (LED) chip. The LED chip is directly integrated onto the PCB, thereby simplifying the connection structure between the light-emitting unit 112 and the substrate 111. This helps reduce energy loss, thereby enabling the COB light source assembly 110 to have higher luminous efficiency.

[0062] In this comparative example, a single-LCD panel 120 projection device further includes the LCD panel 120, a reflector 130, and a lens 140. Light emitted by a COB-type light source assembly 110 illuminates the LCD panel 120. In response to a drive signal, the LCD panel 120 selectively emits the incident light, thereby forming a display image. The display image is then reflected by the reflector 130 to the lens 140, where it is projected onto a screen, forming an image.

[0063] Due to process limitations, the light-emitting area of ​​the COB-type light source assembly 110 is relatively small. In order to evenly illuminate the light emitted by the COB-type light source assembly 110 onto the liquid crystal panel 120, a larger light mixing distance needs to be set. A larger light mixing distance can diffuse the light as much as possible before reaching the liquid crystal panel 120, thereby making the light irradiated to various areas on the liquid crystal panel 120 as uniform as possible, thereby improving the uniformity of illumination. The light mixing distance may refer to: the distance dh1 between the COB-type light source assembly 110 and the next optical assembly 150. The next optical assembly may include, for example, a light funnel or a lens. The light emitted by the COB-type light source assembly 110 is processed by the light funnel or the lens before being irradiated onto the liquid crystal panel 120.

[0064] However, a larger light mixing distance significantly increases the cavity volume of a projection device with a single LCD panel 120. In another example, the problem of a larger light mixing distance can be improved by folding the light path with a reflective structure. However, this method has limited improvements. For example, using a single LCD panel projection device with a 3.5mm LCD panel 120, even after folding the light path with the reflector 130, the light mixing distance is still over 40mm, which is not a satisfactory improvement.

[0065] Moreover, the degree of improvement in illumination uniformity by increasing the light mixing distance is also limited. Taking a single-LCD-panel projection device using a 3.5-inch LCD panel 120 as an example, the illumination uniformity can only reach 55%-65%. In other words, on the light incident surface of the LCD panel 120, the illumination difference between two areas reaches more than 35%, and the display effect is not satisfactory.

[0066] In view of this, an embodiment of the present disclosure provides a display module of a projection device, wherein the display module includes: a light source assembly, a second dimming structure and a liquid crystal panel. The light source assembly includes a first substrate and a plurality of light-emitting units, at least one light-emitting unit includes an independently packaged light-emitting device and a first dimming structure arranged on the light-emitting side of the light-emitting device. The first dimming structure is configured to narrow the light-emitting angle of the light-emitting device. The liquid crystal panel is arranged on the light-emitting side of the light source assembly. The second dimming structure is arranged between the light source assembly and the liquid crystal panel. The second dimming structure is configured to collimate the light emitted by the first dimming structure so that at least part of the light emitted from the second dimming structure is parallel to each other. The display module in the embodiment of the present disclosure can shorten the light mixing distance, while also improving the illumination uniformity of the light source assembly on the liquid crystal panel, thereby achieving a better display effect.

[0067] FIG2 schematically shows a schematic diagram of a projection device according to an embodiment of the present disclosure.

[0068] Referring to Figure 2 , the projection device in the embodiment of the present disclosure includes: a display module 200, a reflector 300, and a lens 400. The reflector 300 is positioned on the light-emitting side of the display module 200. Light emitted from the display module 200 is reflected by the reflector 300 and then projected onto the lens 400 through the lens 400 to form an image. The projection area may include a screen, but this does not constitute a limitation of the present disclosure. For example, the projection area may also be a wall.

[0069] In the embodiment of the present disclosure, the projection device may be a single liquid crystal panel projection device, and the display module 200 may include a liquid crystal panel 210 .

[0070] FIG3 schematically shows a plan view of a liquid crystal panel according to an embodiment of the present disclosure.

[0071] 3 , the liquid crystal panel 210 may include a display area AA and a peripheral area NA.

[0072] The display area AA can have various shapes. For example, the display area AA can be provided in various shapes, such as a polygon (e.g., a rectangle) with straight edges, a circle or an ellipse with curved edges, or a semicircle or a semiellipse with both straight and curved edges. In the embodiment of the present disclosure, the display area AA is provided as a region having a quadrilateral shape with straight edges. It should be understood that this is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure.

[0073] The liquid crystal panel 210 may further include a substrate 211 and a plurality of pixel units P disposed on the substrate 211 and located in the display area AA. Each pixel unit P may include a plurality of sub-pixels PX. In the same pixel unit P, at least two sub-pixels PX may have different colors. For example, the pixel unit P may include a first sub-pixel, a second sub-pixel, and a third sub-pixel. For example, the first sub-pixel may be set as a red sub-pixel, the second sub-pixel may be set as a green sub-pixel, and the third sub-pixel may be set as a blue sub-pixel. However, the embodiments of the present disclosure are not limited to this.

[0074] The liquid crystal panel 210 further includes a base substrate 211, a plurality of gate lines GL, and a plurality of data lines DL. The plurality of gate lines GL and the plurality of data lines DL are disposed on the base substrate 211 and are located at least in the display area AA. The plurality of gate lines GL extend along a first direction X, and the plurality of data lines DL extend along a second direction Y. For example, the first direction X may include the horizontal direction in FIG. 3 , and the second direction Y may include the vertical direction in FIG. 3 , that is, the first direction X and the second direction Y are perpendicular to each other.

[0075] Exemplarily, one subpixel PX is connected to one data line DL and one gate line GL. For example, multiple subpixels PX can be divided into multiple subpixel groups, where one subpixel group includes multiple subpixels PX arranged along a first direction X, and multiple subpixel groups are arranged along a second direction Y. One gate line GL connects one subpixel group, thereby simultaneously providing a turn-on voltage to the subpixel group. Multiple subpixels PX in a subpixel group are respectively connected to different data lines DL, so that when the turn-on voltage is provided to the subpixel group, the required data voltage can be provided to each of the multiple subpixels PX according to display requirements.

[0076] The peripheral area NA may be disposed on at least one side of the display area AA. For example, the peripheral area NA may surround the periphery of the display area AA. In an embodiment of the present disclosure, the peripheral area NA may include a horizontal portion extending in a first direction X and a vertical portion extending in a second direction Y.

[0077] The liquid crystal panel 210 may further include a gate drive circuit 212 and a drive chip 213 that are arranged on the base substrate 211 and located in the peripheral area NA. For example, the gate drive circuit 212 may be located on at least one side of the display area AA. In the embodiment shown in Figure 3, the gate drive circuit 212 is located on the left and right sides of the display area AA, respectively, and the drive chip 213 is located on the lower side of the display area AA. The drive chip 213 includes a data drive circuit, which is used to sequentially latch the input data according to the clock signal and convert the latched data into an analog signal and then input it to each data line DL. The gate drive circuit 212 is usually implemented by a shift register, which converts the clock signal into an on / off voltage and outputs it to each gate line GL respectively.

[0078] It should be noted that although Figure 3 shows that the gate driving circuit 212 is located on the left and right sides of the display area AA and the driving chip 213 is located on the lower side of the display area AA, the embodiments of the present disclosure are not limited to this. The gate driving circuit 212 and the driving chip 213 can be located at any suitable position in the peripheral area NA.

[0079] For example, the gate driver circuit 212 can utilize GOA technology, also known as Gate Driver on Array (GOA). In GOA technology, the gate driver circuit 212 is directly mounted on the substrate 211, replacing an external chip. Each GOA unit functions as a shift register, each of which is connected to a gate line GL. Each shift register outputs scan signals in sequence, achieving row-by-row scanning of the pixel units P.

[0080] 2 , the display module 200 of the embodiment of the present disclosure further includes a light source assembly 220. The light source assembly 220 includes a first substrate 221 and a plurality of light emitting units 222. At least one light emitting unit 222 includes a light emitting device 2221 that is individually packaged.

[0081] In the embodiment of the present disclosure, the first substrate 221 may include a printed circuit board, and the light-emitting device 2221 may include a micro light-emitting diode chip. For example, the light-emitting device 2221 may include a Mini LED. However, this does not constitute a limitation on the embodiment of the present disclosure. For example, the light-emitting device 2221 may also include a Micro LED. Unlike the comparative example, in the embodiment of the present disclosure, the light-emitting device 2221 is pre-packaged. The packaged light-emitting device 2221 can be mounted on the first substrate 221 by welding or other methods. This form of light source assembly 220 may also be referred to as a package on board (POB) light source assembly 220. To better distinguish it from the comparative example, the light source assembly 220 in the embodiment of the present disclosure is hereinafter referred to as a POB light source assembly 220, and the light-emitting device 2221 in the embodiment of the present disclosure is also referred to as a POB light source device 2221. Correspondingly, the light source assembly in the comparative example is also referred to as a COB light source assembly, and the light-emitting device in the comparative example is also referred to as a COB light source device.

[0082] FIG4 schematically shows a schematic diagram of a light emitting unit according to an embodiment of the present disclosure.

[0083] 4 , a POB-type light-emitting device 2221 may include a package support F and a micro-LED L. The package support F is used to package and protect the micro-LED L, preventing foreign matter from entering the interior of the micro-LED L. When the micro-LED L is packaged, patch electrodes may be formed simultaneously. The patch electrodes are electrically connected to corresponding electrodes of the micro-LED L. After packaging, the packaged micro-LED L is mounted on a corresponding position on a printed circuit board.

[0084] Compared to COB-type light source assemblies, the light-emitting devices 2221 in the POB-type light source assembly 220 are independently packaged, and the circuit design is more flexible and more scalable. Therefore, the POB-type light source assembly 220 can adjust the number of light-emitting devices 2221 and the gaps between the light-emitting devices 2221 according to actual needs, thereby forming a larger and more uniform light-emitting surface. In this way, it is beneficial to improve the illumination uniformity of the light emitted by the light source assembly 220 on the liquid crystal panel 210. It should be noted that in the disclosed embodiments, unless otherwise specified, illumination uniformity refers to the illumination uniformity of the light source assembly 220 on the light incident surface of the liquid crystal panel 210.

[0085] In an embodiment of the present disclosure, at least one light-emitting unit 222 further includes a first dimming structure 2222 disposed on the light-emitting side of the light-emitting device 2221 . The first dimming structure 2222 is configured to narrow the light-emitting angle α of the light-emitting device 2221 .

[0086] In the embodiment of the present disclosure, the light output angle α may refer to: the angular range of the main light beam in the light emitted by the light emitting device 2221. The angle between the boundary of the main light beam in the light emitted by the light emitting device 2221 and the optical axis of the light emitting device 2221 may be α / 2. Compared with the COB type light emitting device, the light output angle α of the POB type light emitting device 2221 is larger. For example, the light output angle α of the POB type light emitting device 2221 can reach 120°. In the projection device, the incident light incident on the liquid crystal panel 210 is ideally completely parallel light. To meet this requirement, the light output angle α of the light emitting device 2221 needs to be processed. Therefore, in the embodiment of the present disclosure, a first dimming structure 2222 is provided on the light output side of the light emitting device 2221, and the light emitting angle of the light emitting device 2221 is narrowed by the first dimming structure 2222. For example, the first dimming structure 2222 may include a first lens T1. By adjusting parameters such as the surface shape of the first lens T1 and the distance between the first lens T1 and the light-emitting device 2221, the light-emitting angle α of the light-emitting device 2221 can be narrowed to an optimal level. For example, the first lens T1 can narrow the light-emitting angle α of the light-emitting device 2221 to an acute angle. This helps to collimate the light emitted by the light source assembly 220 before reaching the incident surface of the liquid crystal panel 210.

[0087] 2 , the display module 200 of the embodiment of the present disclosure further includes a second dimming structure 230, which is disposed between the light source assembly 220 and the liquid crystal panel 210. The second dimming structure 230 is configured to collimate the light emitted from the first dimming structure 2222 so that at least part of the light emitted from the second dimming structure 230 is parallel to each other.

[0088] FIG5 schematically shows a schematic diagram of a second dimming structure according to an embodiment of the present disclosure.

[0089] Referring to FIG5 , in an embodiment of the present disclosure, the second dimming structure 230 may include a micro-array lens. In other words, the second dimming structure 230 may include a plurality of second lenses T2 arranged in an array. Each second lens T2 may be provided in correspondence with a light-emitting unit 222, and different second lenses T2 may be provided in correspondence with different light-emitting units 222. For example, by setting the surface shape of the second lens T2 and the spacing between the second lens T2 and the first lens T1, the second lens T2 may be made to collimate the light emitted through the first lens T1. In this way, the light emitted by the plurality of second lenses T2 may be made roughly parallel, thereby making the multiple light rays emitted from the second dimming structure 230 mutually parallel. As a result, the light emitted by the POB light source assembly 220 may be processed into light that meets the needs of projection display.

[0090] Taking a projection device using a 3.5-inch LCD panel 210 as an example, the luminous area of ​​the currently used COB type light source component is about 120mm 2 , where "light-emitting area of ​​the light source assembly 220" or similar expressions may refer to the light-emitting area of ​​the light source assembly 220 as a whole, that is, the total light-emitting area of ​​the multiple light-emitting devices 2221 on the light source assembly 220. To achieve optimal illumination uniformity on the liquid crystal panel 210, a large light mixing distance is required. Even if the light path is folded by a reflector structure, a light mixing distance of at least 40 mm is required. Under this solution, the illumination uniformity of the COB light source assembly on the liquid crystal panel 210 can only reach approximately 55%.

[0091] In the embodiments of the present disclosure, the POB-type light source assembly 220 can form a larger light-emitting surface with more uniform illumination (compared to a COB-type light source assembly) by adjusting the number of light-emitting devices 2221 and the gaps between the light-emitting devices 2221. For example, the light-emitting area of ​​the formed light-emitting surface can be made close to the display area of ​​the liquid crystal panel 210, wherein "the display area of ​​the liquid crystal panel 210" or similar expressions can refer to: the area of ​​the portion of the liquid crystal panel 210 used for display, for example, the area of ​​the display area AA of the liquid crystal panel 210. A larger light-emitting surface with more uniform illumination can achieve a better display effect, and because the illumination is more uniform, the light mixing distance can be shortened, thereby reducing the cavity volume of the projection device, which in turn is conducive to the integration and miniaturization of the projection device.

[0092] The display module of the embodiment of the present disclosure will be further described below with reference to FIG. 1 to FIG. 14 .

[0093] In some embodiments, the light emitting area of ​​the light source assembly 220 is greater than or equal to the display area of ​​the liquid crystal panel 210 , and the difference between the light emitting area of ​​the light source assembly 220 and the display area of ​​the liquid crystal panel 210 is less than or equal to 10%.

[0094] Taking a single liquid crystal panel projection device using a 3.5mm liquid crystal panel 120 as an example, the embodiment of the present disclosure can make the light emitting area of ​​the POB type light source assembly 220 reach 3800mm 2 At this point, even if the light mixing distance dh2 (e.g., the distance between the upper surface of the first substrate 221 and the light incident surface of the second dimming structure 230 in Figure 2 ) is shortened to less than 30 mm, the illumination uniformity of the POB-type light source assembly 220 on the liquid crystal panel 210 can still reach over 85%. Thus, compared to the comparative example, the display module 200 in the disclosed embodiment significantly shortens the light mixing distance dh2 and significantly improves the illumination uniformity of the light source assembly 220 on the liquid crystal panel 210.

[0095] 2 and 4 , in some specific embodiments, the first dimming structure 2222 includes a first columnar portion Z and a first lens T1. The first lens T1 is located on a side of the first columnar portion Z facing away from the light-emitting device 2221. The first lens T1 includes a first curved surface Q1 that protrudes toward the second dimming structure 230. The curvature of the first curved surface Q1 and the thickness h1 of the first columnar portion Z are configured to narrow the light emission angle α of the light-emitting device 2221 from a first angle to a second angle, where the first angle comprises an obtuse angle and the second angle comprises an acute angle.

[0096] In the embodiments of the present disclosure, the light-emitting side of the light-emitting device 2221 may refer to the side of the light-emitting device 2221 facing away from the first substrate 221. Correspondingly, the backlight side of the light-emitting device 2221 may refer to the side of the light-emitting device 2221 close to the first substrate 221. The first columnar portion Z and the first lens T1 may form an integrated structure. The first dimming structure 2222 may also be referred to as a cylindrical lens. Furthermore, the cylindrical lens's light-converging effect narrows the light-emitting angle α of the light-emitting device 2221 to an optimal level. Optionally, the material of the first dimming structure 2222 may include transparent silicone, and the first columnar portion Z may be bonded to the light-emitting side of the light-emitting device 2221.

[0097] In the embodiment of the present disclosure, the degree of convergence of light is jointly adjusted by the curvature of the first lens T1 and the thickness h1 of the first columnar portion Z. In this way, not only can the light output angle α of the light-emitting device 2221 be narrowed to a smaller angle, but also the travel distance of the light in the first dimming structure 2222 can be reasonably set to avoid excessive light loss.

[0098] In some specific embodiments, the ratio of the first angle to the second angle is set to 8:1 to 8:3.

[0099] For example, the range of the first angle can be set to 100° to 140°, and the range of the second angle can be set to 15° to 45°. Optionally, in an embodiment of the present disclosure, the first angle is set to 120° and the second angle is set to 30°.

[0100] For example, the curvature of the first curved surface Q1 can be set to 0.2 to 2.5, for example, the curvature of the first curved surface Q1 can be set to 1.2. The refractive index of the first lens T1 can be set to 1.3 to 1.5, for example, the refractive index of the first lens T1 can be set to 1.41. The thickness h1 of the first columnar portion Z can be set to 2 mm to 6 mm, so that the maximum thickness of the first dimming structure 2222 can be set to 6 mm to 8 mm, for example, 7 mm. In this way, the first dimming structure 2222 can narrow the light output angle α of the light-emitting device 2221 to a smaller angle, thereby facilitating the subsequent adjustment of the incident light into parallel light by the second dimming structure 230. At the same time, the light travels a shorter distance in the first dimming structure 2222, thereby maintaining low light loss. The maximum thickness of the first dimming structure 2222 can refer to the maximum distance h2 between the first curved surface Q1 and the light output surface of the light-emitting device 2221.

[0101] For example, the thickness of the first lens T1 may be greater than the thickness h1 of the first columnar portion Z. However, this does not constitute a limitation to the embodiments of the present disclosure. For example, referring to FIG4 , the thickness h1 of the first columnar portion Z may also be greater than the thickness of the first lens T1. Regardless of whether the thickness h1 of the first columnar portion Z is greater than the thickness of the first lens T1 or less than the thickness h1 of the first lens T1, it is sufficient that the first columnar portion Z and the first lens T1, as a whole, can narrow the light emission angle α of the light-emitting device 2221 to 30°, while ensuring that the maximum distance between the top of the first curved surface Q1 and the light-emitting device 2221 is less than or equal to 8 mm.

[0102] FIG6 schematically shows a plan view of a light source assembly according to an embodiment of the present disclosure, and FIG7 schematically shows a plan view of four adjacent light emitting units according to an embodiment of the present disclosure.

[0103] 4 and 6 , in some specific embodiments, a plurality of light-emitting units 222 are distributed in an array along the first direction X and the second direction Y, a first spacing d1 is provided between two adjacent light-emitting devices 2221 along the first direction X, and a second spacing d2 is provided between two adjacent light-emitting devices 2221 along the second direction Y, and at least one of the first spacing d1 and the second spacing d2 is less than or equal to the maximum spacing h2 between the first curved surface Q1 and the light-emitting surface of the light-emitting device 2221.

[0104] In the embodiment of the present disclosure, the first direction X may include the horizontal direction in Figure 6, and the second direction Y may include the vertical direction in Figure 6. The maximum distance between the first curved surface Q1 and the light emitting surface of the light emitting device 2221 may refer to the distance between the top of the first curved surface Q1 and the light emitting surface of the light emitting device 2221, that is, the maximum thickness of the first dimming structure 2222.

[0105] "Two light-emitting devices 2221 adjacent to each other in the first direction X" may mean that there are no other light-emitting devices 2221 between the two light-emitting devices 2221 in the first direction X. "Two light-emitting devices 2221 adjacent to each other in the second direction Y" may mean that there are no other light-emitting devices 2221 between the two light-emitting devices 2221 in the second direction Y. Optionally, the first distance d1 and the second distance d2 may be substantially the same. For example, the first distance d1 and the second distance d2 may be set between 5 mm and 7 mm, for example, the first distance d1 and the second distance d2 may be set to 6 mm.

[0106] In the embodiment of the present disclosure, multiple light emitting devices 2221 are evenly arranged on the first substrate 221, so that multiple point light sources are formed into a surface light source. Taking a projection device using a 3.5-inch liquid crystal panel 210 as an example, 14 columns and 8 rows of light emitting devices 2221 can be set on the first substrate 221, and the area of ​​each light emitting device 2221 can be set to 7mm 2 Up to 11mm 2 For example, the area of ​​each light emitting device 2221 can be set to 9mm 2 , thereby forming about 3800mm on the first substrate 221 2 It should be noted that the area of ​​the light-emitting device 2221 here may refer to the area of ​​the package bracket F in the light-emitting device 2221. The micro light-emitting diode is packaged between the packages. Therefore, the area of ​​the light-emitting surface of a single light-emitting device 2221 is actually smaller than the area of ​​the light-emitting device 2221.

[0107] In some specific embodiments, the light-emitting device 2221 includes a package support F and a light-emitting portion E exposed by the package support F. The orthographic projection of the first dimming structure 2222 on the first substrate 221 covers the orthographic projection of the light-emitting portion E on the first substrate 221 , and the orthographic projection of the package support F on the first substrate 221 covers the orthographic projection of the first dimming structure 2222 on the first substrate 221 .

[0108] In the embodiments of the present disclosure, the light-emitting portion E may refer to the portion of the micro-LED L exposed by the package bracket F. The side of this portion facing away from the first substrate 221 may serve as the light-emitting surface of the light-emitting device 2221. Referring to FIG4 , the first dimming structure 2222 covers the light-emitting portion E. Specifically, the first columnar portion Z covers the light-emitting portion E. In this way, light emitted from the light-emitting portion E at any angle can be incident on the first dimming structure 2222.

[0109] Optionally, the orthographic projection of the first dimming structure 2222 on the first substrate 221 defines a first pattern, and the orthographic projection of the light-emitting portion E on the first substrate 221 defines a second pattern. The first pattern covers the second pattern and exceeds a first preset distance. The first preset distance can be set to 0.1 mm to 0.3 mm, thereby ensuring that the first dimming structure 2222 can completely cover the light-emitting portion E.

[0110] 4 and 7 , the first dimming structure 2222 can be bonded to the upper surface of the package support F. The first dimming structure 2222 is slightly smaller than the package support F, thereby preventing the first dimming structure 2222 from being suspended in the air. Optionally, the orthographic projection of the package support F on the first substrate 221 defines a third pattern. The third pattern may include a rectangle, the first pattern may include a circle, and the first pattern may be formed as an inscribed circle of the third pattern. However, this does not constitute a limitation on the embodiments of the present disclosure, and the first and third patterns may include any suitable graphics.

[0111] FIG8 schematically shows a plan view of a second dimming structure according to an embodiment of the present disclosure.

[0112] With reference to Figures 2, 5, and 8, in some specific embodiments, the second dimming structure 230 includes multiple second lenses T2. At least one second lens T2 is disposed directly opposite at least one light-emitting unit 222. The orthographic projection of the at least one second lens T2 on the first substrate 221 covers the orthographic projection of the light-emitting unit 222 disposed directly opposite it on the first substrate 221. At least one second lens T2 includes a second curved surface Q2 that protrudes toward the liquid crystal panel 210. The curvature of the second curved surface Q2 is less than that of the first curved surface Q1. The curvature of the first curved surface Q1 is much greater than that of the second curved surface Q2. As a result, the first dimming structure 2222 can significantly converge the emitted light when the light-emitting device 2221 emits light, thereby allowing the light emitted by the light-emitting device 2221 to be concentrated on the light incident surface of the corresponding second lens T2 and then collimated by the second lens T2.

[0113] In an embodiment of the present disclosure, a plurality of second lenses T2 may be arranged in an array along a first direction X and a second direction Y. The second dimming structure 230 may also be referred to as a micro-array lens. Each second lens T2 is disposed directly opposite a light-emitting unit 222, and different second lenses T2 are disposed directly opposite different light-emitting units 222. In other words, the second lenses T2 are disposed in a one-to-one correspondence with the light-emitting units 222. Exemplarily, for each second lens T2 and the light-emitting unit 222 disposed directly opposite the second lens T2, the center of the orthographic projection of the second lens T2 on the first substrate 221 coincides with the center of the orthographic projection of the light-emitting unit 222 on the first substrate 221.

[0114] Optionally, the second dimming structure 230 further includes a second substrate 231 , and the plurality of second lenses T2 are evenly distributed on the second substrate 231 . The plurality of second lenses T2 and the second substrate 231 may form an integrated structure.

[0115] Optionally, the thickness of the second substrate 231 can be set to 1 mm to 3 mm. For example, the thickness of the second substrate 231 can be set to 2 mm or more to prevent the second substrate 231 from being too thin and easily broken. The thickness of the second lens T2 can be set to 2 mm to 4 mm. Optionally, the thickness of the second lens T2 can be greater than or equal to the thickness of the second substrate 231. For example, the thickness of the second substrate 231 can be set to 2 mm, and the thickness of the second lens T2 can be set to 3 mm, but this does not constitute a limitation to the embodiments of the present disclosure. For example, the thickness of the second lens T2 can also be less than the thickness of the second substrate 231, as long as the second lens T2 can collimate the output light of the first dimming structure 2222.

[0116] In some specific embodiments, the ratio of the curvature of the first curved surface Q1 to the curvature of the second curved surface Q2 is 20:9 to 50:1. For example, the curvature of the first curved surface Q1 can be set to 0.2 to 2.5, for example, 1.2. The curvature of the second curved surface Q2 can be set to 0.05 to 0.09, for example, 0.07. This achieves a better collimation effect while also preventing the second lens T2 from being too thick.

[0117] In some specific embodiments, the refractive index of the first lens T1 is lower than the refractive index of the second lens T2. For example, the refractive index of the first lens T1 can be set to 1.3 to 1.5, for example, the refractive index of the first lens T1 can be set to 1.41. The refractive index of the second lens T2 can be set to 1.35 to 1.55, for example, the refractive index of the second lens T2 can be set to 1.47. For example, the material of the second lens T2 may include borosilicate.

[0118] FIG9 schematically shows a schematic diagram of an antireflection film according to an embodiment of the present disclosure.

[0119] 9 , in some specific embodiments, the second dimming structure 230 includes a light incident surface and a light emitting surface, and at least one layer of anti-reflection film ZT is provided on one of the light incident surface and the light emitting surface. The orthographic projection of the anti-reflection film ZT on the first substrate 221 continuously covers the orthographic projections of the plurality of second lenses T2 on the first substrate 221.

[0120] In the embodiments of the present disclosure, the light incident surface of the second dimming structure 230 may refer to the surface of the second dimming structure 230 on the side close to the light source assembly 220. For example, the light incident surface of the second dimming structure 230 may refer to the lower surface of the second substrate 231. The light exit surface of the second dimming structure 230 may refer to the surface of the second dimming structure 230 on the side away from the light source assembly 220. For example, the light exit surface of the second dimming structure 230 may refer to a continuous surface formed by the second curved surfaces Q2 of the plurality of second lenses T2.

[0121] In the embodiments of the present disclosure, one or more layers of antireflection films ZT can be formed on the light-entering and light-emitting surfaces of the second dimming structure 230 through a coating process. For example, six layers of antireflection films ZT can be formed on each of the light-entering and light-emitting surfaces of the second dimming structure 230, thereby achieving an overall transmittance of 99% for the second dimming structure 230. This minimizes optical loss before the light emitted by the light-emitting device 2221 reaches the liquid crystal panel 210. Furthermore, because the effect of the number of antireflection films ZT on the transmittance improvement is not linear, the number of antireflection films ZT should not be too large to minimize process complexity and production costs.

[0122] In some specific embodiments, the maximum thickness h3 of the second dimming structure 230 is smaller than the maximum distance h2 between the first curved surface Q1 and the light emitting surface of the light emitting device 2221. In other words, the maximum thickness h3 of the second dimming structure 230 is smaller than the maximum thickness of the first dimming structure 2222.

[0123] In the embodiments of the present disclosure, the maximum thickness h3 of the second dimming structure 230 may refer to the distance between the top of the second curved surface Q2 and the lower surface of the second substrate 231. For example, the maximum thickness h3 of the second dimming structure 230 may be set to 4 mm to 6 mm. For example, the maximum thickness h3 of the second dimming structure 230 may be set to 5 mm. In this way, the volume of the second dimming structure 230 can be minimized while achieving collimation.

[0124] In some embodiments, there is a third distance (eg, light mixing distance dh2 in FIG. 2 ) between the first substrate 221 and the light incident surface of the second dimming structure 230 , and a ratio of the thickness of the first substrate 221 to the third distance is less than or equal to 1:15.

[0125] In the embodiment of the present disclosure, the thickness of the first substrate 221 can be set to 1 mm to 2 mm. For example, the thickness of the first substrate 221 can be set to 1.5 mm. The third distance is approximately equal to the distance between the light source assembly 220 and the next optical assembly, that is, the light mixing distance dh2. The third distance can be set to 30 mm to 35 mm or less. Compared to the 40 mm light mixing distance in the comparative example, the light mixing distance dh2 in the embodiment of the present disclosure is greatly reduced, which is conducive to the integration and miniaturization of the projection device.

[0126] In the embodiment of the present disclosure, a higher density of light-emitting devices 2221 can be arranged on the first substrate 221. In this way, the illumination uniformity of the light source assembly 220 on the liquid crystal panel 210 can be further improved without changing the area of ​​the light-emitting assembly, thereby further shortening the mixed light distance dh2 and compressing the mixed light distance dh2 to within 30 mm.

[0127] FIG10 schematically shows a schematic diagram of insulating glass according to an embodiment of the present disclosure.

[0128] 10 , in some specific embodiments, an insulating glass 240 is provided between the second dimming structure 230 and the liquid crystal panel 210 , a fourth distance d4 is provided between the second dimming structure 230 and the insulating glass 240 , and a fifth distance d5 is provided between the insulating glass 240 and the liquid crystal panel 210 , and the fifth distance d5 is greater than the fourth distance d4.

[0129] The insulating glass 240 absorbs heat, thereby acting as a thermal barrier between the second dimming structure 230 and the liquid crystal panel 210. In the embodiment of the present disclosure, the insulating glass 240 is as close to the second dimming structure 230 as possible and as far away from the liquid crystal panel 210 as possible. This ensures that the high-temperature area caused by backlighting is kept at a large distance from the liquid crystal panel 210, allowing the liquid crystal panel 210 to operate in a normal temperature environment and preventing overheating.

[0130] In some specific embodiments, the ratio of the fourth distance d4 to the fifth distance d5 is set to 4:11 to 7:8. In this way, while satisfying the heat insulation effect, the insulation glass 240 and the second dimming structure 230 can maintain an optimal distance from each other, so that the light emitted by the second dimming structure 230 can be fully illuminated on the insulation glass 240.

[0131] In some specific embodiments, the maximum distance between the side of the light emitting unit 222 facing away from the first substrate 221 and the light emitting surface of the light emitting device 2221 is greater than the fourth distance d4 and smaller than the fifth distance d5.

[0132] In the embodiment of the present disclosure, the maximum distance between the side of the light-emitting unit 222 facing away from the first substrate 221 and the light-emitting surface of the light-emitting device 2221 can refer to the maximum distance h2 between the first curved surface Q1 and the light-emitting surface of the light-emitting device 2221. Exemplarily, the fourth distance d4 can be set to 4mm to 7mm, for example, the fourth distance d4 can be set to 5mm. The fifth distance d5 is set to 8mm to 11mm, for example, the fifth distance d5 can be set to 9mm. In this way, the liquid crystal panel 210 can be protected from operating within the normal temperature range (≤70°C).

[0133] In some specific embodiments, the light incident surface of the liquid crystal panel 210 includes multiple light incident areas arranged in an array along the first direction X and the second direction Y, and the illumination difference of the output light of the second dimming structure 230 at the center of any two light incident areas is less than or equal to 20%.

[0134] FIG11 schematically shows a schematic diagram of a first projection according to an embodiment of the present disclosure.

[0135] 11 , software can be used to simulate a first projection TY of the emitted light from the second dimming structure 230 on a preset horizontal plane and divide it into nine equally sized 3*3 projection sub-areas, denoted as the first projection sub-area P11, the second projection sub-area P12, the third projection sub-area P13, the fourth projection sub-area P14, the fifth projection sub-area P15, the sixth projection sub-area P16, the seventh projection sub-area P17, the eighth projection sub-area P18, and the ninth projection sub-area P19. For example, the first projection TY can include a rectangle, and the size of the first projection TY can be set to 84 mm by 46 mm.

[0136] The irradiance at the center point of each projection sub-area is collected, and the irradiance at the center point of each projection sub-area is shown in Table 1.

[0137] Table 1

[0138] Then, the irradiance uniformity P1≈86.44% is calculated according to formula (1). Formula (1) is as follows: P1=(P11'+P13'+P17'+P19') / (4*P15') (1)

[0139] P11' represents the irradiance of the first projection sub-area P11, P13' represents the irradiance of the third projection sub-area P13, P15' represents the irradiance of the fifth projection sub-area P15, P17' represents the irradiance of the seventh projection sub-area P17, and P19' represents the irradiance of the ninth projection sub-area P19.

[0140] FIG12 schematically shows a schematic diagram of an actual lighting area according to an embodiment of the present disclosure.

[0141] 12 , in an embodiment of the present disclosure, at the time of final imaging, the size of the actual illumination area ZM (or the light incident surface of the liquid crystal panel 210) can be slightly smaller than the size of the first projection, thereby selecting an intermediate area with better illumination uniformity. For example, the illumination area can include a rectangle, and the size of the illumination area can be set to 78mm*44mm. Accordingly, the illumination area can be evenly divided into 9 illumination sub-areas of equal size, 3*3 in total, which are respectively recorded as the first illumination sub-area P21, the second illumination sub-area P22, the third illumination sub-area P23, the fourth illumination sub-area P24, the fifth illumination sub-area P25, the sixth illumination sub-area P26, the seventh illumination sub-area P27, the eighth illumination sub-area P28 and the ninth illumination sub-area P29.

[0142] The illuminance at the center point of each lighting sub-area is collected, and the illuminance at the center point of each lighting sub-area is shown in Table 2.

[0143] Table 2

[0144] Then, the illumination uniformity P2≈89.75% is calculated according to formula (2). Formula (2) is as follows: P2=(P21′+P23′+P27′+P29′) / (4*P25′) (2)

[0145] Wherein, P21' represents the illuminance of the first illumination sub-area P21, P23' represents the illuminance of the third illumination sub-area P23, P25' represents the illuminance of the fifth illumination sub-area P25, P27' represents the illuminance of the seventh illumination sub-area P27, and P29' represents the illuminance of the ninth illumination sub-area P29. It should be noted that since Tables 1 and 2 use different simulation software, their brightness parameters (irradiance in Table 1 and illuminance in Table 2) differ. However, illumination uniformity is a relative value, so the illumination uniformity obtained with different brightness parameters is of the same level.

[0146] Based on the above simulation, during actual imaging, the illumination uniformity is close to 90%. Even if affected by factors such as assembly process and material stability, the illumination uniformity of actual imaging can be greater than or equal to 85%, so that the illumination difference between any two light incident areas on the light incident surface of the liquid crystal panel 210 is less than 20%.

[0147] Compared with the comparative example in which the illumination uniformity is 55%, the embodiment of the present disclosure improves the illumination uniformity to 85%, and the improvement effect is obvious.

[0148] In some specific embodiments, the multiple light-emitting units 222 include multiple light-emitting unit groups, different light-emitting unit groups include different light-emitting units 222, at least one light-emitting unit group is electrically connected to the local backlight adjustment circuit through at least one first signal line, and different light-emitting unit groups are electrically connected to the local backlight adjustment circuit through different first signal lines.

[0149] In the embodiments of the present disclosure, the POB-type light-emitting devices 2221 are independently packaged, and the wiring design on the first substrate 221 is more flexible. This allows for the provision of corresponding first signal lines for each light-emitting unit group as needed. This enables the local backlight adjustment circuit to implement zoned brightness control on a per-light-emitting unit group basis through local dimming technology. In the embodiments of the present disclosure, the brightness of the corresponding light-emitting unit group can be adjusted based on the brightness distribution of the image to be displayed. For example, for bright portions of the image to be displayed, the brightness of the light-emitting unit group providing backlighting for that portion can be maximized. For dark portions of the image to be displayed, the brightness of the light-emitting unit group providing backlighting for that portion can be reduced or even turned off to achieve optimal contrast. Furthermore, reducing or turning off the brightness of some light-emitting unit groups can also reduce the power consumption of the light source assembly 220. In the comparative example, the dynamic contrast ratio was approximately 60:1. However, the embodiments of the present disclosure, through local dimming technology, can achieve a dynamic contrast ratio of approximately 110:1, an improvement of approximately 183%, resulting in a significant visual effect.

[0150] In summary, the embodiment of the present disclosure applies the POB type light source assembly 220 to a single liquid crystal panel projection device, which reduces the light mixing distance dh2 while improving the uniformity of illumination, which is beneficial to the integration and miniaturization of the projection device and can also achieve better display effects. The embodiment of the present disclosure also adjusts the large-angle light output of the POB type light source assembly 220 into parallel light through the first dimming structure 2222 (cylindrical lens) and the second dimming structure 230 (microarray lens) to meet the display needs of the transmission device. In addition, the embodiment of the present disclosure also combines local light control technology to perform partition control on the POB type light source assembly 220, effectively improving the dynamic contrast.

[0151] Some embodiments of the present disclosure further provide a projection device. FIG13 schematically shows a schematic diagram of a projection device according to an embodiment of the present disclosure.

[0152] 2 and 13 , the projection device in the embodiment of the present disclosure includes: a display module 200, a reflector 300, and a lens 400. The reflector 300 is disposed between the display module 200 and the lens 400. The reflector 300 is located on the light-emitting side of the display module 200. The light emitted by the display module 200 can be reflected by the reflector 300 into the lens 400, and then projected onto the area to be projected through the lens 400 to form an image. The area to be projected may include a screen, but this does not constitute a limitation to the embodiment of the present disclosure. For example, the area to be projected may also be any entity suitable as the area to be projected, such as a wall.

[0153] In the embodiment of the present disclosure, the projection device may be a single liquid crystal panel projection device, and the display module 200 may include the display module 200 in the above embodiment.

[0154] Taking a projection device using a 3.5-inch LCD panel 210 as an example, the luminous area of ​​the currently used COB type light source component is about 120mm 2 , wherein "the light-emitting area of ​​the light source assembly 220" or similar expressions may refer to: the light-emitting area of ​​the light source assembly 220 as a whole, that is, the total light-emitting area of ​​the multiple light-emitting devices 2221 on the light source assembly 220. In order to achieve better illumination uniformity of the COB-type light source assembly on the liquid crystal panel 210, even if the light path is folded by the reflector 300, a light mixing distance dh of at least 40 mm needs to be set. Under this solution, the illumination uniformity of the COB-type light source assembly on the liquid crystal panel 210 can reach approximately 55%. In the embodiment of the present disclosure, the POB-type light source assembly 220 can make the light-emitting area of ​​the light source assembly 220 close to the display area of ​​the liquid crystal panel 210 by adjusting the number of light-emitting devices 2221 and the gaps between the light-emitting devices 2221. For example, the difference between the light-emitting area of ​​the light source assembly 220 and the display area of ​​the liquid crystal panel 210 is less than or equal to 10%. Here, "display area of ​​the liquid crystal panel 210" or similar expressions may refer to: the area of ​​the portion of the liquid crystal panel 210 used for display, for example, the area of ​​the display area AA in the liquid crystal panel 210. For example, the embodiment of the present disclosure can make the light emitting area of ​​the POB type light source assembly 220 reach 3800mm 2 At this point, even if the light mixing distance dh2 is shortened to less than 30 mm, the illumination uniformity of the POB light source assembly 220 on the liquid crystal panel 210 can still reach over 85%. Thus, the display module 200 in the disclosed embodiment not only shortens the light mixing distance dh2 but also improves the illumination uniformity of the light source assembly 220 on the liquid crystal panel 210, thereby achieving a better display effect.

[0155] FIG14 schematically shows a schematic diagram of heat dissipation of a projection device according to an embodiment of the present disclosure.

[0156] Referring to FIG. 14 , in some specific embodiments, the projection device further includes a first sealed cavity QT and a first fan FJ1 disposed within the first sealed cavity QT. The second dimming structure 230 and the liquid crystal panel 210 are both located within the first sealed cavity QT. Furthermore, the insulating glass 240 between the second dimming structure 230 and the liquid crystal panel 210 is also located within the first sealed cavity QT. The orthographic projection of any of the second dimming structure 230, the liquid crystal panel 210, and the insulating glass 240 on the bottom wall of the first sealed cavity QT does not overlap with the orthographic projection of the first fan FJ1 on the bottom wall of the first sealed cavity QT. The first fan FJ1 includes a first air outlet K11 and a first air inlet K21. The first air outlet K11 is disposed toward a first region located between the second dimming structure 230 and the liquid crystal panel 210. For example, the first air outlet K11 may be disposed toward the insulating glass 240. The first air inlet K21 and the first air outlet K11 have different directions. The first air inlet K21 is arranged toward at least one inner wall of the first sealed cavity QT.

[0157] In the embodiment of the present disclosure, since the light mixing distance dh2 is significantly reduced, but the total output power of the projection device is not reduced, the heat flux density in the area where the display module 200 is located increases. Therefore, in the embodiment of the present disclosure, a first fan FJ1 is disposed within the first sealed cavity QT. The first fan FJ1 may include a centrifugal fan, and there may be multiple first fans FJ1. The first air outlet K11 of the first fan FJ1 faces the insulating glass 240, so that the air blown by the first fan FJ1 can pass through at least the upper and lower sides of the insulating glass 240 to remove heat from the upper and lower sides of the insulating glass 240. The axial direction of the first air inlet K21 intersects the axial direction of the first air outlet K11. For example, the axial direction of the first air inlet K21 is perpendicular to the axial direction of the first air outlet K11. In this way, internal circulating air is generated within the first sealed cavity QT, thereby removing heat from the upper and lower sides of the insulating glass 240 to the cavity walls of the first sealed cavity QT. The cavity wall can exchange heat with the outside world, thereby discharging heat from the first sealed cavity QT.

[0158] Therefore, the first fan FJ1 arranged in the first sealed cavity QT can improve the heat dissipation efficiency in the first sealed cavity QT. At the same time, the internal circulating air will not bring external impurities into the optical path of the display module 200, avoiding foreign matter adhering to the optical device and affecting the display effect.

[0159] In some specific embodiments, the display module 200 further includes a Fresnel lens assembly 250 disposed on a side of the liquid crystal panel 210 facing away from the second dimming structure 230. The second dimming structure 230 is integrally formed with the bottom wall of the first sealed cavity QT, and the Fresnel lens assembly 250 is integrally formed with the top wall of the first sealed cavity QT. The first air inlet K21 is disposed toward the top wall of the first sealed cavity QT, and the orthographic projection of the first air inlet K21 on the bottom wall of the first sealed cavity QT does not overlap with the orthographic projection of the Fresnel lens assembly 250 on the bottom wall of the first sealed cavity QT.

[0160] In the embodiment of the present disclosure, light emitted from the liquid crystal panel 210 is processed by the Fresnel lens assembly 250, then irradiated onto the reflector 300, and then reflected into the lens 400. Referring to FIG14 , the Fresnel lens assembly 250 serves as part of the top wall of the first sealed cavity QT, and the second dimming structure 230 serves as part of the bottom wall of the first sealed cavity QT. In addition, the rest of the cavity wall of the first sealed cavity QT can be made of a metal material with good thermal conductivity to improve heat exchange efficiency.

[0161] Referring to Figure 14 , the first fan FJ1 can be fixedly mounted at the left end of the bottom wall of the first sealed cavity QT. The display module 200 is located at the right end of the first sealed cavity QT. The first fan FJ1 is spaced apart from the display module 200 to prevent the first fan FJ1 from affecting the optical path of the display module 200. The first air outlet K11 is positioned to the left, and the first air inlet K21 is positioned upward, thereby forming an internal circulation system as shown in Figure 14 .

[0162] In some specific embodiments, the bottom wall of the first sealed cavity QT is made of metal, and the display module 200 further includes a second fan FJ2 and a vent K3. The second fan FJ2 and the vent K3 communicate with the outside of the projection device. The second fan FJ2 and the vent K3 are arranged along a third direction. A first gap JX exists between the bottom wall of the first sealed cavity QT and the light source assembly 220. The second fan FJ2 and the vent K3 are both connected to the first gap JX. In other words, the second fan FJ2, the first gap JX, and the vent K3 form a first air path that removes heat from the bottom wall of the first sealed cavity QT and the light source assembly 220.

[0163] In an embodiment of the present disclosure, the bottom wall of the first sealed cavity QT may include a metal material that is easily heat-conducting, such as aluminum. The second fan FJ2 may include an axial flow fan. The number of second fans FJ2 may be multiple, and multiple second fans FJ2 may be arranged on the same side of the light source assembly 220. Referring to Figure 14, multiple second fans FJ2 may be arranged on the left side of the light source assembly 220, and the vent may be arranged on the right side of the light source assembly 220. Multiple second fans FJ2 may be arranged side by side in a direction perpendicular to the paper surface of Figure 14, thereby forming an external circulation wind as shown in Figure 14. The external circulation wind flows from right to left (or from left to right), thereby taking the heat on the bottom wall of the first sealed cavity QT and the heat from the light source assembly 220 and its vicinity out of the projection device to achieve a heat dissipation effect.

[0164] Optionally, the vent K3 may include a plurality of first air guide holes that are evenly distributed, and the second fan FJ2 may include a plurality of second air guide holes, so that air can flow evenly in the projection device.

[0165] In the embodiment of the present disclosure, the area with the highest temperature in the projection device is concentrated on the surface of each optical device in the first sealed cavity QT. By improving the heat dissipation efficiency of the first sealed cavity QT in the above manner, the maximum temperature of the hottest position in the first sealed cavity QT (for example, the surface of the insulating glass 240) can be made not to exceed 70°C (the measured data is 62.672°C), and the temperature of all optical devices is within the tolerance temperature of each device, thereby ensuring that after the mixed light distance dh2 is shortened, each optical device can still work normally.

[0166] In summary, the embodiment of the present disclosure applies the POB type light source assembly 220 to a single liquid crystal panel projection device, reduces the light mixing distance dh2 and improves the uniformity of illumination, which is conducive to the integration and miniaturization of the projection device, and can also achieve a better display effect. The embodiment of the present disclosure also adjusts the large-angle light output of the POB type light source assembly 220 to parallel light through the first dimming structure 2222 (cylindrical lens) and the second dimming structure 230 (microarray lens) to meet the display needs of the projection device. The embodiment of the present disclosure also combines local light control technology to perform partition control on the POB type light source assembly 220, effectively improving the dynamic contrast. In addition, the embodiment of the present disclosure also improves the heat dissipation efficiency of the projection device through the first fan FJ1 and the second fan FJ2, so that the POB type light source assembly 220 can be better used in the single liquid crystal panel projection device, avoiding the risk of overheating caused by the shortening of the light mixing distance dh2.

[0167] It should be understood that the projection device according to the embodiment of the present disclosure has all the features and advantages of the above-mentioned display module 200. For details, please refer to the above description and will not be repeated here.

[0168] It should be noted that the above description only illustrates the technical solutions of the embodiments of the present disclosure by way of example, and does not mean that the embodiments of the present disclosure are limited to the above steps and structures. Where possible, the steps and structures can be adjusted and selected as needed. Therefore, some steps and units are not essential elements for implementing the overall inventive concept of the embodiments of the present disclosure.

[0169] The present disclosure has been described so far in conjunction with preferred embodiments. It should be understood that those skilled in the art may make various other changes, substitutions, and additions without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the scope of the embodiments of the present disclosure is not limited to the specific embodiments described above, but is defined by the appended claims.

Claims

1. A display module of a projection device, wherein: include: A light source assembly, the light source assembly comprising a first substrate and a plurality of light emitting units; At least one light-emitting unit includes an independently packaged light-emitting device and a first dimming structure arranged on a light-emitting side of the light-emitting device, wherein the first dimming structure is configured to: narrow the light-emitting angle of the light-emitting device; A liquid crystal panel disposed on the light emitting side of the light source assembly; A second dimming structure is disposed between the light source assembly and the liquid crystal panel, and the second dimming structure is configured to collimate the light emitted from the first dimming structure so that at least part of the light emitted from the second dimming structure is parallel light.

2. The display module according to claim 1, wherein: The first dimming structure includes a first columnar portion and a first lens, wherein the first lens is located on a side of the first columnar portion away from the light emitting device; The first lens includes a first curved surface protruding toward the second dimming structure, and the curvature of the first curved surface and the thickness of the first columnar portion are configured to narrow the light output angle of the light-emitting device from a first angle to a second angle, wherein the first angle includes an obtuse angle and the second angle includes an acute angle.

3. The display module according to claim 2, wherein: The ratio of the first angle to the second angle is set to 8:1 to 8:

3.

4. The display module according to claim 2, wherein: The multiple light-emitting units are distributed in an array along a first direction and a second direction, a first spacing is provided between two adjacent light-emitting devices along the first direction, and a second spacing is provided between two adjacent light-emitting devices along the second direction, and at least one of the first spacing and the second spacing is less than or equal to the maximum spacing between the first curved surface and the light-emitting surface of the light-emitting device.

5. The display module according to claim 4, wherein: The light emitting device comprises a packaging support and a light emitting portion exposed by the packaging support; The orthographic projection of the first dimming structure on the first substrate covers the orthographic projection of the light-emitting portion on the first substrate, and the orthographic projection of the packaging bracket on the first substrate covers the orthographic projection of the first dimming structure on the first substrate.

6. The display module according to claim 2, wherein: The second dimming structure includes a plurality of second lenses, at least one of the second lenses is arranged opposite to at least one of the light-emitting units, and an orthographic projection of at least one of the second lenses on the first substrate covers an orthographic projection of the light-emitting unit arranged opposite to the second lens on the first substrate; At least one of the second lenses includes a second curved surface protruding toward the liquid crystal panel, and a curvature of the second curved surface is smaller than a curvature of the first curved surface.

7. The display module according to claim 6, wherein: A ratio of a curvature of the first curved surface to a curvature of the second curved surface is 20:9 to 50:

1.

8. The display module according to claim 6, wherein: A refractive index of the first lens is smaller than a refractive index of the second lens.

9. The display module according to claim 6, wherein: The second dimming structure includes a light incident surface and a light emitting surface, one of the light incident surface and the light emitting surface is provided with at least one layer of anti-reflection film, and the orthographic projection of the anti-reflection film on the first substrate continuously covers the orthographic projections of the plurality of second lenses on the first substrate.

10. The display module according to claim 2, wherein: The maximum thickness of the second dimming structure is smaller than the maximum distance between the first curved surface and the light emitting surface of the light emitting device.

11. The display module according to claim 1, wherein: A third distance is provided between the first substrate and the light incident surface of the second dimming structure, and a ratio of a thickness of the first substrate to the third distance is less than or equal to 1:

15.

12. The display module according to claim 1, wherein: An insulating glass is arranged between the second dimming structure and the liquid crystal panel, a fourth distance is formed between the second dimming structure and the insulating glass, a fifth distance is formed between the insulating glass and the liquid crystal panel, and the fifth distance is greater than the fourth distance.

13. The display module according to claim 12, wherein: A ratio of the fourth interval to the fifth interval is set to 4:11 to 7:

8.

14. The display module according to claim 12, wherein: A maximum distance between a side of the light-emitting unit facing away from the first substrate and a light-emitting surface of the light-emitting device is greater than the fourth distance and less than the fifth distance.

15. The display module according to claim 1, wherein: The light incident surface of the liquid crystal panel includes a plurality of light incident areas arranged in an array along a first direction and a second direction, and the illumination difference of the output light of the second dimming structure at the centers of any two light incident areas is less than or equal to 20%.

16. The display module according to claim 1, wherein: The multiple light-emitting units include multiple light-emitting unit groups, different light-emitting unit groups include different light-emitting units, at least one of the light-emitting unit groups is electrically connected to the local backlight adjustment circuit through at least one first signal line, and different light-emitting unit groups are electrically connected to the local backlight adjustment circuit through different first signal lines.

17. The display module according to any one of claims 1 to 16, wherein: The light emitting area of ​​the light source assembly is greater than or equal to the display area of ​​the liquid crystal panel, and the difference between the light emitting area of ​​the light source assembly and the display area of ​​the liquid crystal panel is less than or equal to 10%.

18. A projection device, wherein: Including display module, reflector and lens; The reflector is arranged between the display module and the lens, and the light emitted by the display module can be reflected into the lens through the reflector; Wherein, the display module comprises the display module as described in any one of claims 1 to 17.

19. The projection device according to claim 18, wherein: The projection device further includes a first sealed cavity and a first fan disposed in the first sealed cavity, and the second dimming structure and the liquid crystal panel are both located in the first sealed cavity; Either the second dimming structure or the liquid crystal panel is on the bottom wall of the first sealed cavity The orthographic projection of the first fan on the bottom wall of the first sealed cavity does not overlap with the orthographic projection of the first fan on the bottom wall of the first sealed cavity; The first fan includes a first air outlet and a first air inlet, the first air outlet is arranged toward a first area, the first area is located between the second dimming structure and the liquid crystal panel, the first air inlet and the first air outlet have different directions, and are arranged toward at least one side inner wall of the first sealed cavity.

20. The projection device according to claim 19, wherein: The display module further comprises a Fresnel lens assembly disposed on a side of the liquid crystal panel away from the second dimming structure, the second dimming structure and the bottom wall of the first sealed cavity form an integrated structure, and the Fresnel lens assembly and the top wall of the first sealed cavity form an integrated structure; The first air inlet is arranged toward the top wall of the first sealed cavity, and an orthographic projection of the first air inlet on the bottom wall of the first sealed cavity does not overlap with an orthographic projection of the Fresnel lens assembly on the bottom wall of the first sealed cavity.

21. The projection device according to claim 18, wherein: The bottom wall of the first sealed cavity comprises a metal material, the display module further comprises a second fan and a vent, and the second fan and the vent are in communication with the outside of the projection device; The second fan and the vent are arranged along a third direction, a first gap exists between the bottom wall of the first sealed cavity and the light source assembly, and the second fan and the vent are both connected to the first gap.

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