Display module and projection device

Abstract

The application discloses a display module and a projection device, and belongs to the technical field of display technology.The display module comprises a first light modulation assembly, a second light modulation assembly and a display panel which are arranged at intervals, the display panel is located between the first light modulation assembly and the second light modulation assembly, the first light modulation assembly is configured to modulate incident light incident on the display panel into first light rays of a first polarization direction, the second light modulation assembly is configured to modulate light emitted by the display panel into second light rays of a second polarization direction, and the first polarization direction and the second polarization direction are orthogonal; wherein the second light modulation assembly comprises a first polaroid, the first polaroid comprises a first polarizing layer and first support layers located on opposite sides of the first polarizing layer, and the refractive indexes of at least one first support layer in at least two spatial directions of a three-dimensional space of the display panel are the same.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display module and projection device used in the field of projection display. Background Technology

[0002] Projectors are trusted by young consumers due to their affordability, rich colors, portability, and variety of designs. Current projectors include LCD (Liquid Crystal Display) projectors, which mainly consist of a liquid crystal display panel, a light source, a lens, and a heat dissipation module. Utility Model Content

[0003] In a first aspect of the embodiment, a display module is provided, the display module comprising:

[0004] A first dimming component, a second dimming component, and a display panel are spaced apart, with the display panel located between the first dimming component and the second dimming component. The first dimming component is configured to modulate incident light incident on the display panel into a first ray with a first polarization direction, and the second dimming component is configured to modulate light emitted from the display panel into a second ray with a second polarization direction. The first polarization direction and the second polarization direction are orthogonal.

[0005] The second dimming component includes a first polarizer, which includes a first polarizing layer and first support layers located on opposite sides of the first polarizing layer. At least one of the first support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0006] In an exemplary embodiment, the first dimming component further includes a second polarizer, the second polarizer including a second polarizing layer and second support layers located on opposite sides of the second polarizing layer;

[0007] Wherein, at least one of the second support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0008] In one exemplary embodiment, each of the first support layers located on both sides of the first polarizer has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel; any of the second support layers located on both sides of the second polarizer has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0009] In one exemplary embodiment, the first dimming component further includes a first light-transmitting substrate and a polarizing brightness enhancement film;

[0010] The polarizing brightening film is located on the side of the first light-transmitting substrate away from the display panel, and the second polarizer is located on the side of the first light-transmitting substrate closer to the display panel.

[0011] In an exemplary embodiment, the first dimming component includes a first light-transmitting substrate, and the second dimming component includes a second light-transmitting substrate located on one side of the first polarizer;

[0012] Wherein, the coefficient of thermal expansion of the first light-transmitting substrate is less than or equal to the coefficient of thermal expansion of the second light-transmitting substrate.

[0013] In one exemplary embodiment, the ratio of the coefficient of thermal expansion of the first transparent substrate to that of the second transparent substrate is 0.5 to 1.

[0014] In an exemplary embodiment, the first dimming component includes a first light-transmitting substrate, and the second dimming component includes a second light-transmitting substrate located on one side of the first polarizer;

[0015] The thickness of the first light-transmitting substrate is greater than or equal to the thickness of the second light-transmitting substrate.

[0016] In one exemplary embodiment, the ratio of the thickness of the first light-transmitting substrate to the thickness of the second light-transmitting substrate is 1 to 2.

[0017] In one exemplary embodiment, the thickness of the first light-transmitting substrate is 0.5 mm to 2 mm, and the thickness of the second light-transmitting substrate is 0.5 mm to 2 mm.

[0018] In an exemplary embodiment, the first dimming component includes a first light-transmitting substrate and an optical film located on one side of the first light-transmitting substrate, and a first transparent adhesive is disposed between the optical film and the first light-transmitting substrate;

[0019] The refractive index of the first transparent adhesive is the same as that of the first light-transmitting substrate;

[0020] The optical film includes a multilayer reflective brightening film, or a polarizing brightening film and a second polarizer.

[0021] In an exemplary embodiment, the first dimming component includes a first light-transmitting substrate, a polarizing brightness enhancement film, and a second polarizer; the polarizing brightness enhancement film and the second polarizer are respectively located on opposite sides of the first light-transmitting substrate;

[0022] Wherein, a second transparent adhesive is disposed between the polarizing brightening film and the first light-transmitting substrate, and a third transparent adhesive is disposed between the second polarizing film and the first light-transmitting substrate;

[0023] The refractive index of the second transparent adhesive is the same as that of the first light-transmitting substrate, and the refractive index of the third transparent adhesive is the same as that of the first light-transmitting substrate or the second polarizer.

[0024] In one exemplary embodiment, the second dimming component includes a second light-transmitting substrate located on the side of the first polarizer facing away from the display panel;

[0025] A fourth transparent adhesive is disposed between the first polarizer and the second light-transmitting substrate, and the refractive index of the fourth transparent adhesive is the same as that of the second light-transmitting substrate.

[0026] In one exemplary embodiment, at least a portion of the gap between the first dimming component and the display panel includes a first transparent heat sink; and / or, at least a portion of the gap between the second dimming component and the display panel includes a second transparent heat sink.

[0027] In one exemplary embodiment, at least a portion of the gap region between the first dimming component and the display panel includes a first air duct; and / or, at least a portion of the spacing between the second dimming component and the display panel.

[0028] In one exemplary embodiment, the system includes a first air duct and a second air duct, wherein the size of the first air duct is larger than the size of the second air duct in the normal direction of the display surface of the display panel.

[0029] In an exemplary embodiment, the distance between the first dimming component and the display panel is 2mm-20mm in the normal direction of the display surface of the display panel, and the distance between the second dimming component and the display panel is 2mm-20mm.

[0030] In an exemplary embodiment, the first dimming component includes a first light-transmitting substrate, a polarizing brightness enhancement film located on the side of the first light-transmitting substrate opposite to the display panel, and a second polarizer located on the side of the first light-transmitting substrate close to the display panel; the second dimming component includes a second light-transmitting substrate;

[0031] The second polarizer is located on the side of the polarizing brightening film closest to the display panel, and the first polarizer is located on the side of the second light-transmitting substrate closest to the display panel.

[0032] In one exemplary embodiment, the first dimming component includes a first light-transmitting substrate and a multilayer reflective brightness enhancement film located on the side of the first light-transmitting substrate near the display panel; the second dimming component includes a second light-transmitting substrate;

[0033] The first polarizer is located on the side of the second light-transmitting substrate closest to the display panel.

[0034] In one exemplary embodiment, the display panel includes a color filter substrate, an array substrate, and a liquid crystal layer located between the color filter substrate and the array substrate;

[0035] The array substrate is located between the color filter substrate and the second dimming component, and the color filter substrate is located between the first dimming component and the array substrate.

[0036] In a second aspect embodiment, a projection device is provided, comprising:

[0037] First Mirror;

[0038] The second Fresnel lens is positioned opposite to the first Fresnel lens;

[0039] A light source assembly is located on the side of the first Fresnel lens that is opposite to the second Fresnel lens; and,

[0040] The display module described in any of the first aspects is located between the second Fresnel lens and the first Fresnel lens, and is spaced apart from both the second Fresnel lens and the first Fresnel lens.

[0041] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the scale in the drawings is for illustration only and does not represent the actual scale.

[0043] Figures 1-10 A schematic diagram of the stacked structure of several display modules is shown;

[0044] Figure 11 A schematic diagram of the film stacking structure of the first polarizer is shown;

[0045] Figure 12 A cross-sectional structural diagram of the display panel is shown;

[0046] Figure 13A top view of the display panel structure is shown;

[0047] Figure 14 A cross-sectional structural schematic diagram of the first dimming component is shown;

[0048] Figure 15 A cross-sectional structural schematic diagram of the second dimming component is shown;

[0049] Figure 16 A front view of an optical stack of a projection device is shown;

[0050] Figure 17 It shows Figure 16 A cross-sectional view of the optical stacking of the projection equipment shown;

[0051] Figure 18 It shows Figure 16 A three-dimensional schematic diagram of the optical stacking of the projection equipment shown;

[0052] Figure 19 A front view of the optical stack of another projection device is shown;

[0053] Figure 20 It shows Figure 19 A cross-sectional view of the optical stacking of the projection equipment shown;

[0054] Figure 21 It shows Figure 19 The diagram shows a three-dimensional schematic of the optical stacking of the projection device.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100, First dimming component; 200, Display panel; 300, Second dimming component; 400, First Fresnel lens; 500, Second Fresnel lens; 600, Light source; 700, Optical cup; 800, Imaging mirror; 900, Lens; 11, First transparent substrate; 12, Multilayer reflective brightness enhancement film; 13, Second polarizer; 14, Polarizing brightness enhancement film; 15, First transparent adhesive; 21, Array substrate; 22, Color filter substrate; 31, Second transparent substrate; 32, First polarizer; 61, First transparent heat sink; 62, Second transparent heat sink; 321, First release film; 322 / 324, First support layer; 323, First polarizing layer; 325 / 135, Pressure-sensitive adhesive layer; 326, Second release film; 131, Third release film; 132 / 134, Second support layer; 133, Second polarizing layer; 136, Fourth release film; 211, Substrate; 212, Gate; 213, Gate insulating layer; 217, Active layer; 218, Source; 216, Drain; 219, Data line; 214, Interlayer dielectric layer; 215, Planarization layer; 301, Liquid crystal layer; 221, Light-shielding layer; 222, Opening; 151, Second transparent adhesive; 152, Third transparent adhesive; 701, Convex lens; 702, Illumination reflector. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0058] In this specification, "electrical connection" and "coupling" include situations where components are connected together by elements that have some electrical function. There are no particular limitations on what constitutes an "electrical function," as long as it allows for the transmission and reception of electrical signals between the connected components. Examples of "electrical functions" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with various functions.

[0059] In this specification, "parallel" refers to the state where the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore also includes the state where the angle is greater than or equal to -5° and less than 5°. Similarly, "perpendicular" refers to the state where the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore also includes the state where the angle is greater than or equal to 85° and less than 95°.

[0060] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0061] Taking an LCD projector as an example, a projector mainly consists of an LCD panel, a light source, a lens, and a heat dissipation module. The light source provides backlighting for the LCD panel. To increase the brightness of the projector's image, projectors typically use high-power LED (Light Emitting Diode) light sources. This results in extremely high temperatures within the projector's internal cavity, causing a rapid temperature rise within a short period. The LCD panel, located within this high-temperature cavity, locally absorbs heat, leading to a larger coefficient of thermal expansion in the liquid crystal material and slight deformation of the polarizer. This causes a slight change in the relative position between the polarizer and the LCD panel, resulting in a change in the optical path difference.

[0062] Changes in the optical path difference can alter the polarization state of light passing through the liquid crystal display panel, thereby affecting optical phenomena such as light interference and diffraction. Ultimately, this can lead to problems such as uneven brightness, color distortion, decreased contrast, blurred images, and light leakage in dark states.

[0063] In view of this, embodiments of this application provide a display module and a projection device. The display module includes a first dimming component 100, a second dimming component 300, and a display panel 200 spaced apart. The display panel 200 is located between the first dimming component 100 and the second dimming component 300. The first dimming component 100 is configured to modulate incident light onto the display panel 200 into a first ray with a first polarization direction. The second dimming component 300 is configured to modulate light emitted from the display panel 200 into a second ray with a second polarization direction. The first polarization direction and the second polarization direction are perpendicular to each other. The second dimming component 300 includes a first polarizer 32. The first polarizer 32 includes a first polarizing layer 323 and first support layers located on opposite sides of the first polarizing layer 323. At least one of the first support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0064] By separating the first dimming component 100, the second dimming component 300, and the display panel 200, the heat transferred from the light source 600 to the liquid crystal panel, and from the liquid crystal panel to the first polarizer 32, can be reduced. This allows the heat emitted by the light source 600 to be evenly distributed on the surface of the liquid crystal panel, thereby reducing the degree of deformation of the first polarizer 32 due to high temperatures. This enables more precise control of the polarization direction and propagation path of light, reducing light scattering and reflection losses, and improving light utilization. Consequently, the brightness and contrast of the projected image are enhanced, resulting in more vibrant and realistic colors, providing users with a better visual experience. Furthermore, the separation of the polarizer and the liquid crystal display panel 200 helps reduce heat transfer and improves the heat dissipation capacity of the core components.

[0065] Furthermore, at least one first support layer in the first polarizer 32 on the light-emitting side has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel. This reduces the phase difference when light emitted from the display panel 200 enters the first polarizer 32, ensuring that the light passing through the first polarizer 32 has zero phase difference. With the phase difference reduced, the optical path difference can be further reduced, thereby optimizing the display effect.

[0066] The display module and projection device in the embodiments of this utility model will be described by way of example below with reference to the accompanying drawings.

[0067] Please refer to Figures 1-11 As shown, Figures 1-10 Several schematic diagrams of stacked display modules are shown, such as Figure 11 A schematic diagram of the film stacking structure of the first polarizer 32 is shown, as follows: Figures 1-11 As shown, the display module in this embodiment may include: a first dimming component 100, a second dimming component 300, and a display panel 200 arranged at intervals.

[0068] The display panel 200 is located between the first dimming component 100 and the second dimming component 300;

[0069] The first dimming component 100 is configured to modulate the incident light onto the display panel 200 into light with a first polarization direction.

[0070] The second dimming component 300 is configured to modulate the light emitted from the display panel 200 into light with a second polarization direction, wherein the first polarization direction and the second polarization direction are orthogonal.

[0071] The second dimming component 300 includes a first polarizer 32, which includes a first polarizing layer 323 and first support layers located on opposite sides of the first polarizing layer 323. At least one of the first support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0072] First, it should be noted that the refractive index being the same in the various embodiments proposed in this application can mean that it is approximately the same. For example, the refractive index of the first support layer being the same in at least two spatial directions in the three-dimensional space of the display panel can mean that the refractive index of the first support layer is equal in at least two spatial directions in the three-dimensional space of the display panel, or that the difference between the refractive indices of the first support layer in at least two spatial directions in the three-dimensional space of the display panel is less than 0.05. When the difference is between 0 and 0.05, it can be considered that the refractive indices are equal.

[0073] The display module proposed in this embodiment can be applied to single-chip projection devices, that is, projection devices that include an LCD display module.

[0074] In the projection device, the display module of this embodiment is located between the second Fresnel lens 500 and the first Fresnel lens 400, and is spaced apart from both the second Fresnel lens 500 and the first Fresnel lens 400.

[0075] In this embodiment, the display panel 200 may not include the backlight 600, such as Figure 1 As shown, the display panel 200 can be a liquid crystal display panel 200, which includes a color filter substrate 22, an array substrate 21, and a liquid crystal layer 301 located between the color filter substrate 22 and the array substrate 21.

[0076] like Figure 12 As shown, Figure 12 A cross-sectional structural schematic diagram of the display panel 200 is shown, as follows: Figure 12 As shown, the array substrate 21 includes multiple sub-pixel regions, each including a pixel driving circuit and a pixel electrode connected to the pixel driving circuit. In some display panels 200, the array substrate 21 can be an ADS (Advanced Super Dimension Switch) substrate or a HADS-type substrate. This type of array substrate 21 may also include a common electrode located on one side of the pixel electrode and insulated from it. Either the pixel electrode or the common electrode in this display panel 200 may include multiple slits. Thus, a vertical electric field can be formed between the pixel electrode and the common electrode, and a planar electric field can be formed between the multiple slits. The vertical and planar electric fields can jointly drive the liquid crystal in the liquid crystal layer 301 to deflect, thereby expanding the viewing angle.

[0077] For example, a pixel driving circuit may include two transistors and one capacitor (2T1C); or, a pixel circuit may include four transistors and two capacitors (4T2C); or, a pixel circuit may include five transistors and two capacitors (5T2C); or, a pixel circuit may include six transistors and two capacitors (6T1C); or, a pixel circuit may include seven transistors and one capacitor (7T1C); or, a pixel circuit may include eight transistors and one capacitor (8T1C).

[0078] The embodiments of the pixel circuit in this application are not limited thereto. In other embodiments, the pixel circuit may also include more transistors, more capacitors, or other devices.

[0079] Furthermore, the type of transistor in the pixel circuit described above is not limited. For example, the transistor may include an N-type transistor; or, the transistor may include a P-type transistor; or, the transistor may include both N-type and P-type transistors.

[0080] In one example, the pixel driving circuit may include a driving transistor, which may include a substrate 211, a gate 212 located on one side of the substrate 211, a gate insulating layer 213 located on one side of the gate 212, an active layer 217 located on the side of the gate insulating layer 213 away from the gate 212, a source 218 and a drain 216 located on the side of the active layer 217 away from the gate 212, the source 218 and the drain 216 being in contact with the active layer 217; and an interlayer dielectric layer 214 located on the side of the source 218 and the drain 216 away from the substrate, and a planarization layer 215 located on the side of the interlayer dielectric layer 214 away from the substrate.

[0081] The drain 216 is electrically connected to the pixel electrode (not shown in the figure). The pixel electrode can be located on the side of the source 218 and drain 216 in the thin film transistor away from the gate 212. A planarization layer can be provided between the pixel electrode and the thin film transistor. The pixel electrode can be electrically connected to the data line 219. The gate 212 can be connected to the gate 212 scan line.

[0082] like Figure 12 As shown, the color filter substrate 22 includes a light-shielding layer 221, also known as a black matrix layer, which is formed of a black opaque material. The light-shielding layer 221 may include a plurality of openings 222, each opening 222 corresponding to a sub-pixel region. In one example, the orthographic projection of the opening 222 on the array substrate 21 may at least partially overlap with the pixel electrode.

[0083] like Figure 13 As shown, Figure 13A top view of the display panel 200 is shown. A color filter layer, such as a green filter layer G, a red filter layer R, and a blue filter layer B, can be disposed within the opening 222. The green filter layer G, the red filter layer R, and the blue filter layer B are arranged in an array on the color filter substrate 22, and are arranged adjacent to each other. For example, as... Figure 13 The multiple openings 222 shown are arranged in multiple rows and columns. Color filter layers in a row can all correspond to the same color, while color filter layers in a column and each adjacent color filter layer can correspond to different colors.

[0084] Alternatively, in some other examples, adjacent color filters in a row can correspond to different colors, while color filters in a column can correspond to the same color.

[0085] Using the display panel 200 in this example, the display panel 200 can display color images, so that the projection device can display a color image by projecting the display screen of the display panel 200.

[0086] In this embodiment, the first dimming component 100 and the second dimming component 300 can be located on opposite sides of the display panel 200. The first dimming component 100 can be located on the side away from the display surface of the display panel 200, and the second dimming component 300 can be located on the side close to the display surface of the display panel 200.

[0087] like Figures 1-5 As shown, the first dimming component 100 can be located between the display panel 200 and the first Fenwick lens 400, and the second dimming component 300 can be located between the display panel 200 and the second Fenwick lens 500. In the projection device, the light source 600 is located on the side of the first Fenwick lens 400 facing away from the first dimming component 100. Therefore, the light emitted from the light source 600 enters the first dimming component 100 through the first Fenwick lens 400, passes through the first dimming component 100 to the display panel 200, exits through the display panel 200 to the second dimming component 300, and enters the second Fenwick lens 500 after passing through the second dimming component 300.

[0088] The first dimming component 100 is mainly used to modulate the light incident on the display panel 200 into light with a first polarization direction, and the second dimming component 300 is mainly used to modulate the light emitted from the display panel 200 into light with a second polarization direction. The first polarization direction and the second polarization direction are orthogonal, thereby realizing the display of the image on the display panel 200.

[0089] The first dimming component 100 and the display panel 200 are spaced apart, and the second dimming component 300 and the display panel 200 are also spaced apart, thus allowing the polarizer required for the liquid crystal display to be separated from the display panel 200. This space between the first dimming component 100 and the display panel 200 reduces the amount of heat generated by the light source 600 transferred from the first dimming component 100 to the display panel 200, while the space between the second dimming component 300 and the display panel 200 reduces the heat transferred from the display panel 200 to the first polarizer 32.

[0090] In this way, the heat generated by the light source 600 can be largely dissipated between the first dimming component 100 and the display panel 200, and between the second dimming component 300 and the display panel 200, thereby reducing the temperature at the first polarizer 32 and thus reducing the degree of deformation of the first polarizer 32 due to high temperature. After the degree of deformation of the first polarizer 32 is reduced, the change in relative position between the first polarizer 32 and the display panel 200 caused by the deformation of the first polarizer 32 can be avoided, thereby reducing the optical path difference of the display module. As a result, the polarization direction and propagation path of light can be controlled more precisely, reducing light scattering and reflection losses, improving light utilization, thereby improving the brightness and contrast of the projected image, making the colors more vivid and realistic, and bringing users a better visual experience.

[0091] In this embodiment, the second dimming component 300 includes a first polarizer 32, which is mainly used to modulate the light emitted from the display panel 200 into light with a second polarization direction.

[0092] like Figure 11 As shown, the first polarizer 32 may include a first polarizing layer 323 and first support layers located on opposite sides of the first polarizing layer 323. The first polarizing layer 323 may be a polyvinyl alcohol (PVA) film, and the first support layer may be a cellulose triacetate (TAC) film, with the first support layer providing support for the first polarizing layer 323.

[0093] like Figure 11 As shown, a first support layer is included on both sides of the first polarizing layer 323. In one example, the two first support layers may have the same thickness, and in another example, the two first support layers may have different thicknesses.

[0094] In this embodiment, at least one first support layer has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel. In one example, one first support layer may have the same refractive index in at least two spatial directions in the three-dimensional space of the display panel, or both first support layers may be configured to have the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0095] If the refractive index of one first support layer is the same in at least two spatial directions in the three-dimensional space of the display panel, the refractive index of the other first support layer can be unrestricted.

[0096] In one example, such as Figure 1 and Figure 14 As shown, the three-dimensional space of the display panel can have three mutually perpendicular directions, such as the horizontal direction x and the vertical direction y, which are perpendicular to the horizontal direction, of the plane where the display surface of the display panel is located, and the thickness direction z of the display panel. The first support layer having the same refractive index in at least two spatial directions of the three-dimensional space of the display panel can include:

[0097] The first support layer has the same refractive index in the horizontal x direction and the vertical y direction;

[0098] The first support layer has the same refractive index in the horizontal x-direction and the thickness z-direction;

[0099] The first support layer has the same refractive index in the thickness direction z and the vertical direction y;

[0100] The first support layer has the same refractive index in the horizontal x direction, the vertical y direction, and the thickness z direction.

[0101] In this embodiment, the first support layer, where the refractive index is the same in at least two spatial directions in the three-dimensional space of the display panel, can be referred to as a zero-phase film layer.

[0102] For example, such as Figure 11 As shown, the first polarizer 32 includes a first support layer 322 on the side close to the display panel 200 and a first support layer 324 on the side away from the display panel 200. In one example, the first support layer 322 on the side close to the display panel 200 may be a zero-phase film layer, and the first support layer 324 on the side away from the display panel 200 may be a non-zero-phase film layer.

[0103] In one example, the refractive index of the first support layer 324 on the side away from the display panel 200 can be the same as the refractive index of the first polarizing layer 323, while the refractive index of the first support layer 322 on the side closer to the display panel 200 can be greater than the refractive index of the first polarizing layer 323.

[0104] like Figure 11As shown, in some examples, the first polarizer 32 may further include a first release film 321 and a second release film 326, wherein the first release film 321 is located on the side of one of the first support layers 322 opposite to the first polarizing layer 323, and the second release film 326 is located on the side of another first support layer 324 opposite to the first polarizing layer 323; a pressure-sensitive adhesive layer 325 is also provided between the first release film 321 and the first support layer 322, or between the second release film 326 and the first support layer 324.

[0105] The first release film 321 and the second release film 326 can be PET (Polyethylene Terephthalate) films.

[0106] The first release film 321 and the second release film 326 can be coated with a single-sided silicone coating technology, which has excellent strength and flatness, effectively protects the pressure-sensitive adhesive layer 325 from damage, and avoids the generation of air bubbles during bonding.

[0107] In this embodiment, at least one first support layer in the first polarizer 32 on the light-emitting side of the display panel 200 has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel. As a result, the phase difference can be reduced when the light emitted from the display panel 200 passes through the first polarizer 32.

[0108] Please refer to the following formula (1):

[0109]

[0110] in, δ represents the phase difference, and δ represents the optical path difference.

[0111] Therefore, it can be seen that when the phase difference is reduced, the optical path difference can be further reduced. When the optical path difference is reduced, optical phenomena such as light interference and diffraction can be improved, ultimately enhancing the brightness uniformity, color performance, contrast, and image clarity of the displayed image.

[0112] In some embodiments, such as Figures 4-5 As shown, the first dimming assembly 100 may include a second polarizer 13, which can be used to modulate incident light onto the display panel 200 into light with a first polarization direction. The second polarizer 13 includes a second polarizing layer 133 and second support layers located on opposite sides of the second polarizing layer 133; wherein at least one second support layer has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0113] In this embodiment, please refer to Figure 11As shown, the second polarizer 13 includes a second polarizing layer 133 and second support layers located on opposite sides of the second polarizing layer 133; such as a second support layer 132 including the side of the second polarizing layer 133 near the display panel 200, and a second support layer 134 including the side of the second polarizing layer 133 away from the display panel 200.

[0114] Both of the second support layers are in direct contact with the second polarizing layer 133.

[0115] In this configuration, at least one of the two second support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel. For example, one of the second support layers may have the same refractive index in at least two spatial directions in the three-dimensional space of the display panel, or both second support layers may be zero-phase films.

[0116] When the refractive index of a second support layer is the same in at least two spatial directions in the three-dimensional space of the display panel, the refractive index of the other second support layer may be less than or greater than the refractive index of the second polarizing layer 133.

[0117] For example, such as Figure 11 As shown, the second polarizer 13 includes a second support layer on the side near the display panel 200 and a second support layer on the side away from the display panel 200. In one example, the second support layer near the display panel 200 may be a zero-phase film layer, and the refractive index of the second support layer on the side away from the display panel 200 may be greater than the refractive index of the second polarizing layer 133. In another example, the second support layer on the side away from the display panel 200 may be a zero-phase film, and the refractive index of the second support layer near the display panel 200 may be less than the refractive index of the second polarizing layer 133.

[0118] like Figure 11 As shown, in some examples, the second polarizer 13 may further include a third release film 131 and a fourth release film 136, wherein the third release film 131 is located on the side of one of the second support layers 132 opposite to the second polarizing layer 133, and the fourth release film 136 is located on the side of another second support layer 134 opposite to the second polarizing layer 133; a pressure-sensitive adhesive layer is also provided between the third release film 133 and the second support layer 132, or between the fourth release film 136 and the second support layer 1342.

[0119] The third release film 131 and the fourth release film 136 can be PET (Polyethylene Terephthalate) films.

[0120] Among them, the third release film 131 and the fourth release film 136 can adopt the single-sided coating technology of silicone coating, which has excellent strength and flatness, effectively protects the pressure-sensitive adhesive layer 135 from damage, and avoids the generation of air bubbles during bonding.

[0121] In this embodiment, at least one second support layer in the second polarizer 13 on the light-incident side of the display panel 200 has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel. This reduces the phase difference of the light rays passing sequentially from the light source 600 through the first dimming component 100, the display panel 200, and the second dimming component 300, thereby further reducing the optical path difference of the display module and further improving the brightness uniformity, color performance, contrast, and image clarity of the displayed image.

[0122] In some examples, each first support layer located on both sides of the first polarizer 32 has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel, that is, each first support layer is a zero-phase film layer. Any second support layer located on both sides of the second polarizer 13 has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel, that is, one of the two second support layers is a zero-phase film layer.

[0123] In this example, when both first support layers on both sides of the first polarizer 32 are zero-phase film layers, the optical path difference of light emitted from the display panel 200 through the second dimming component 300 can be reduced. When one of the second support layers of the second polarizer 13 is a zero-phase film layer, the optical path difference of light emitted from the light source 600 through the first dimming component 100 can be guaranteed. Thus, the manufacturing cost of the first dimming component 100 can be reduced while reducing the optical path difference of the entire display module.

[0124] In this example, in the second polarizer 13, the second support layer of the second polarizer 133 on the side of the display panel 200 may have the same refractive index in at least two spatial directions in the three-dimensional space of the display panel.

[0125] In some embodiments, the first dimming component 100 may further include a first light-transmitting substrate 11, and the second dimming component 300 includes a second light-transmitting substrate 31 located on one side of the first polarizer 32.

[0126] The coefficient of thermal expansion of the first light-transmitting substrate 11 is less than or equal to the coefficient of thermal expansion of the second light-transmitting substrate 31.

[0127] Please combine Figures 1-10 As shown, both the first light-transmitting substrate 11 and the second light-transmitting substrate 31 are transparent substrates, which allow light to pass through.

[0128] In one example, the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can have high light transmittance. For example, the materials of the first light-transmitting substrate 11 and the second light-transmitting substrate 31 are preferably borosilicate glass, which has the characteristics of high transmittance and low cost. For another example, the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be made of sapphire glass, whose main component is aluminum oxide, and which has the characteristics of high hardness, wear resistance, high thermal conductivity, and high temperature resistance.

[0129] In this embodiment, the first light-transmitting substrate 11 is located on the side of the display panel 200 close to the light source 600, and the second light-transmitting substrate 31 is located on the side of the display panel 200 away from the light source 600. In this way, the temperature of the first light-transmitting substrate 11 is higher than that of the second light-transmitting substrate 31. When the coefficient of thermal expansion of the first light-transmitting substrate 11 is less than or equal to the coefficient of thermal expansion of the second light-transmitting substrate 31, the degree of deformation of the first light-transmitting substrate 11 due to high temperature can be reduced, thereby reducing the deformation of the second polarizer 13 attached to the first light-transmitting substrate 11. As a result, the optical path difference can be further reduced.

[0130] The coefficient of thermal expansion of the second light-transmitting substrate 31 is greater than that of the first light-transmitting substrate 11, which can expand the range of materials that can be selected for the second light-transmitting substrate 31. For example, the second light-transmitting substrate 31 can be made of sapphire glass with a high coefficient of thermal expansion to increase the transmittance.

[0131] In this way, the manufacturing cost of the display module can be reduced while ensuring the light output efficiency, and deformation of the first dimming component 100 and the second dimming component 300 can be avoided to reduce the optical path difference.

[0132] In this example, the ratio of the thermal expansion coefficient of the first light-transmitting substrate 11 to that of the second light-transmitting substrate 31 is 0.5 to 1. For example, the ratio between the thermal expansion coefficients of the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be 0.5, 0.55, 0.56, 0.60, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1.

[0133] In some examples, where the first dimming component 100 includes a first light-transmitting substrate 11 and the second dimming component 300 includes a second light-transmitting substrate 31, the thickness of the first light-transmitting substrate 11 may be greater than or equal to the thickness of the second light-transmitting substrate 31.

[0134] As described in the above embodiments, the first light-transmitting substrate 11 is closer to the light source 600 than the second light-transmitting substrate 31. Therefore, the thickness of the first and second light-transmitting substrates 11 can affect the heat dissipation and insulation capabilities of the heat generated by the light source 600. When the thickness of the first light-transmitting substrate 11 is greater, the heat dissipated to the display panel 200 can be reduced, thereby reducing the degree of expansion of the liquid crystal in the display panel 200 due to high temperature.

[0135] In one example, the thickness of the first light-transmitting substrate 11 may be greater than the thickness of the second light-transmitting substrate 31, thereby reducing the heat diffused from the heat source to the display panel 200 and the second dimming component 300.

[0136] In one example, the thickness of the first light-transmitting substrate 11 can be equal to the thickness of the second light-transmitting substrate 31. In this way, the heat dissipation capabilities of the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be made consistent. In this case, the heat diffused to the display panel 200 and the second dimming component 300 from the heat source can be reduced, and the heat dissipation in the second dimming component 300 can be ensured, thereby reducing the degree of deformation of the first polarizer 32.

[0137] In one example, when the thickness of the second light-transmitting substrate 31 is less than the thickness of the first light-transmitting substrate 11, the transmittance of light emitted from the display panel 200 through the second light-transmitting substrate 31 can be increased, thereby improving the display brightness and reducing unevenness in dark states.

[0138] In one example, if the thickness of the first light-transmitting substrate 11 is equal to the thickness of the second light-transmitting substrate 31, the coefficient of thermal expansion of the first light-transmitting substrate 11 can be less than the coefficient of thermal expansion of the second light-transmitting substrate 31.

[0139] In one example, the thickness of the first transparent substrate 11 is 0.5 mm to 2 mm, and the thickness of the second transparent substrate 31 is 0.5 mm to 2 mm.

[0140] For example, the thickness of the first light-transmitting substrate 11 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm, or 2mm; and the thickness of the second light-transmitting substrate 31 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1.1mm, 1.2mm, 1.4mm, 1.5mm, 1.7mm, or 2mm.

[0141] In one example, the ratio of the thickness of the first light-transmitting substrate 11 to the thickness of the second light-transmitting substrate 31 is 1 to 2. Exemplarily, the ratio of the thickness of the first light-transmitting substrate 11 to the thickness of the second light-transmitting substrate 31 can be 1, 1.2, 1.2, 1.4, 1.5, 1.6, 1.8, or 2.

[0142] For example, the thickness of the first light-transmitting substrate 11 is 0.6 mm, and the thickness of the second light-transmitting substrate 31 is 0.5 mm; the thickness of the first light-transmitting substrate 11 is 0.8 mm, and the thickness of the second light-transmitting substrate 31 can be 0.67 mm; the thickness of the first light-transmitting substrate 11 is 0.8 mm, and the thickness of the second light-transmitting substrate 31 can be 0.53 mm; the thickness of the first light-transmitting substrate 11 is 1 mm, and the thickness of the second light-transmitting substrate 31 can be 0.63 mm; the thickness of the first light-transmitting substrate 11 is 2 mm, and the thickness of the second light-transmitting substrate 31 can be 1 mm; the thickness of the first light-transmitting substrate 11 is 1.6 mm, and the thickness of the second light-transmitting substrate 31 can be 1.1 mm; the thickness of the first light-transmitting substrate 11 is 1.8 mm, and the thickness of the second light-transmitting substrate 31 can be 1.13 mm.

[0143] In one example, the thickness of the first transparent substrate 11 and the thickness of the second transparent substrate 31 can both be 1 mm.

[0144] In one example of this embodiment, the first dimming component 100 includes a first light-transmitting substrate 11 and an optical film located on one side of the first light-transmitting substrate 11. The optical film may include a multilayer reflective brightening film 12, or a polarizing brightening film 14 and a second polarizer 13.

[0145] In one example, such as Figures 3-4 As shown, the optical film may include a polarizing brightness enhancement film 14 and a second polarizer 13. The polarizing brightness enhancement film 14 may be located on the side of the second polarizer 13 that is opposite to the display panel 200.

[0146] For example, such as Figure 3 As shown, the polarizing brightening film 14 and the second polarizer 13 can be located on the same side of the first light-transmitting substrate 11, such as on the side of the first light-transmitting substrate 11 away from the display panel 200.

[0147] For example, such as Figure 4 As shown, the polarizing brightening film 14 and the second polarizer 13 can be located on opposite sides of the first light-transmitting substrate 11, such that the polarizing brightening film 14 is located on the side of the first light-transmitting substrate 11 away from the display panel 200, and the second polarizer 13 is located on the side of the first light-transmitting substrate 11 close to the display panel 200.

[0148] Please refer to Figure 4 As shown, in this example, the light emitted by the light source 600 passes through the polarizing brightening film 14 and then enters the first light-transmitting substrate 11, and then enters the second polarizer 13 via the first light-transmitting substrate 11.

[0149] In this embodiment, the polarizing brightening film 14 can be an APF (Advanced Polarizing Film) film. The polarizing brightening film 14 and the second polarizer 13 are bonded together, which can increase the backlight utilization rate of the light source 600 by more than 30%, and the use of the second polarizer 13 can improve the contrast, further improving the display effect and unevenness in dark states.

[0150] In another example of this embodiment, the optical film may include a multilayer reflective brightening film 12. The multilayer reflective brightening film (DLRP-Direct Laminate Reflective Polarizer) can transmit polarized light and can replace the second polarizer 13. It has good transmittance and can provide better optical performance. Furthermore, the multilayer reflective brightening film 12 utilizes the characteristics of high reflectivity to perform polarization cycling, which can reduce the loss of light effect and thus improve image quality.

[0151] When using a multi-layer reflective brightness enhancement film 12, the screen brightness can be increased by more than 10%, and the temperature resistance is greater than 110℃, which has a higher reliability advantage.

[0152] In one example, in the case of including a multilayer reflective brightening film 12, such as Figure 1 As shown, the multilayer reflective brightness enhancement film 12 can be located on the side of the first light-transmitting substrate 11 that is away from the display panel 200.

[0153] In yet another example, such as Figure 2 As shown, the multilayer reflective brightness enhancement film 12 can be located on the side of the first light-transmitting substrate 11 close to the display panel 200. In this way, the optical path difference before the light enters the display panel 200 can be reduced, further improving the display effect and dark state unevenness.

[0154] Please combine Figure 3 As shown, in one example of this embodiment, the optical film in the first dimming component 100 can be located on one side of the first light-transmitting substrate 11. If a multilayer reflective brightness enhancement film 12 is included, the multilayer reflective brightness enhancement film 12 can be located on the side of the first light-transmitting substrate 11 closest to the display panel 200, or on the side of the first light-transmitting substrate 11 away from the display panel 200. If a second polarizer 13 and a polarizing brightness enhancement film 14 are included, the second polarizer 13 and the polarizing brightness enhancement film 14 can both be located on the same side of the first light-transmitting substrate 11 away from the display panel 200.

[0155] In this example, the first dimming component 100 may further include a first transparent adhesive 15 between the optical film and the first light-transmitting substrate 11; wherein the refractive index of the first transparent adhesive 15 is the same as the refractive index of the first light-transmitting substrate 11.

[0156] In this embodiment, please refer to Figure 14 As shown, Figure 14 A cross-sectional structural schematic diagram of the first dimming component 100 is shown, as follows: Figure 14 As shown in Figure (1), the first transparent adhesive 15 can be located between the multilayer reflective brightening film 12 and the first light-transmitting substrate 11, as follows: Figure 14 As shown in (2), the first transparent adhesive 15 can be located between the second polarizer 13 and the first light-transmitting substrate 11.

[0157] In this process, the light emitted by the light source 600 first enters the first transparent adhesive 15 from the optical film, and then enters the first transparent substrate 11 from the first transparent adhesive 15.

[0158] The first transparent adhesive 15 has the same refractive index as the first light-transmitting substrate 11. This reduces the phase difference of the incident light rays incident on the display panel 200, thereby reducing the optical path difference of the incident light rays and improving problems such as uneven screen brightness, color distortion, and image blurring.

[0159] In yet another example, such as Figure 2 As shown, the optical film is a multilayer reflective brightness enhancement film 12, which can be located on the side of the first light-transmitting substrate 11 close to the display panel 200. In this case, the refractive index of the first transparent adhesive 15 can also be the same as the refractive index of the multilayer reflective brightness enhancement film 12. This can reduce the phase difference of the incident light rays incident on the display panel 200, thereby reducing the optical path difference of the incident light rays and improving problems such as uneven screen brightness, color distortion, and image blurring.

[0160] In one embodiment, when the optical film includes a polarizing brightening film 14 and a second polarizer 13, and the polarizing brightening film 14 and the second polarizer 13 are located on opposite sides of the first light-transmitting substrate 11, a second transparent adhesive 151 is disposed between the polarizing brightening film 14 and the first light-transmitting substrate 11, and a third transparent adhesive 152 is disposed between the second polarizer 13 and the first light-transmitting substrate 11; wherein the refractive index of the second transparent adhesive 151 is the same as that of the first light-transmitting substrate 11, and the refractive index of the third transparent adhesive 152 is the same as that of the first light-transmitting substrate 11 or the second polarizer 13.

[0161] In this embodiment, please refer to Figure 15 As shown, the second transparent adhesive 151 has the same refractive index as the first light-transmitting substrate 11, thereby reducing the phase difference of light incident from the polarizing brightening film 14 onto the first light-transmitting substrate 11; when the refractive index of the third transparent adhesive 152 is the same as that of the first light-transmitting substrate 11, the phase difference of the line incident from the first light-transmitting substrate 11 onto the third transparent adhesive 152 can be reduced; when the refractive index of the third transparent adhesive 152 is the same as that of the second polarizer 13, the phase difference of the line incident from the third transparent adhesive 152 onto the second polarizer 13 can be reduced.

[0162] In this embodiment, the phase difference of light can be reduced on both sides of the first light-transmitting substrate 11, thereby reducing the optical path difference of light incident on the display panel 200, thus improving problems such as uneven screen brightness, color distortion, and image blurring.

[0163] In some embodiments, the second dimming component 300 includes a second light-transmitting substrate 31 located on the side of the first polarizer 32 facing away from the display panel 200; wherein a fourth transparent adhesive is disposed between the first polarizer 32 and the second light-transmitting substrate 31, and the refractive index of the fourth transparent adhesive is the same as the refractive index of the second light-transmitting substrate 31.

[0164] In this embodiment, when the refractive index of the fourth transparent adhesive is the same as that of the second light-transmitting substrate 31, the phase difference of the light emitted from the second dimming component 300 can be reduced, thereby further reducing the optical path difference on the display side of the display panel 200 and improving problems such as uneven screen brightness, color distortion, and image blurring.

[0165] In this embodiment, the first polarizer 32 can be located on the side of the first light-transmitting substrate 11 close to the display panel 200. When the first polarizer 32 is located on the side of the first light-transmitting substrate 11 close to the display panel 200, the optical path difference of the display panel 200 through the second dimming component 300 can be further reduced, thereby improving problems such as uneven screen brightness, color distortion, and image blurring.

[0166] Of course, in some cases, the first polarizer 32 may also be located on the side of the first light-transmitting substrate 11 away from the display panel 200.

[0167] In the above embodiments, the first transparent adhesive 15, the second transparent adhesive 151, the third transparent adhesive 152 and the fourth transparent adhesive can all be optically clear adhesives (OCA).

[0168] When using optically transparent adhesive, good light transmittance at the bonding interface can be guaranteed, and light can pass through the adhesive layer with almost no refraction or scattering, which can help reduce the phase difference of light.

[0169] In some embodiments, at least a portion of the gap between the first dimming component 100 and the display panel 200 includes a first transparent heat sink 61; and / or, at least a portion of the gap between the second dimming component 300 and the display panel 200 includes a second transparent heat sink 62.

[0170] For example, please refer to Figures 6-7 As shown, Figure 6 and Figure 7 A schematic diagram of the stacking of two display modules is shown, such as Figure 6As shown, a first transparent heat sink 61 can be provided in at least a portion of the gap area between the first dimming component 100 and the display panel 200, and a second transparent heat sink 62 can be provided in at least a portion of the gap area between the second dimming component 300 and the display panel 200. Figure 7 As shown, the first transparent heat sink 61 can be provided only in at least a portion of the gap area between the first dimming component 100 and the display panel 200. Alternatively, the second transparent heat sink 62 can be provided only in at least a portion of the gap area between the second dimming component 300 and the display panel 200.

[0171] In one example, when a first transparent heat sink 61 is provided, the first transparent heat sink 61 may be located on the side of the first light-transmitting substrate 11 close to the display panel 200.

[0172] For example, such as Figure 6 As shown, the first dimming component 100 may include a first light-transmitting substrate 11 and an optical film located on the side of the first light-transmitting substrate 11 facing away from the display panel 200. A first transparent heat sink 61 may be attached to the side of the first light-transmitting substrate 11 closest to the display panel 200 and in contact with the first light-transmitting substrate 11. To avoid optical path difference caused by phase difference, the refractive index of the first transparent heat sink 61 may be the same as the refractive index of the first light-transmitting substrate 11. In this example, the optical film may be a multilayer reflective brightness enhancement film 12, or it may be a second polarizer 13 and a polarizing brightness enhancement film 14 in contact with each other.

[0173] As another example, the first dimming component 100 may include a first light-transmitting substrate 11 and a multilayer reflective brightness enhancement film 12 located on the side of the first light-transmitting substrate 11 near the display panel 200. A first transparent heat sink 61 may be attached to the side of the multilayer reflective brightness enhancement film 12 near the display panel 200 and in contact with the multilayer reflective brightness enhancement film 12. In order to avoid optical path difference caused by phase difference, the refractive index of the first transparent heat sink 61 may be the same as the refractive index of the multilayer reflective brightness enhancement film 12.

[0174] As another example, the first dimming component 100 may include a first light-transmitting substrate 11, a polarizing brightness enhancement film 14 located on the side of the first light-transmitting substrate 11 facing away from the display panel 200, and a second polarizer 13 located on the side of the first light-transmitting substrate 11 close to the display panel 200. A first transparent heat sink 61 may be attached to and in contact with the second polarizer 13 on the side of the second polarizer 13 close to the display panel 200. To avoid optical path difference caused by phase difference, the refractive index of the first transparent heat sink 61 may be the same as the refractive index of the second polarizer 13.

[0175] like Figure 6 and Figure 7As shown, there may be a gap between the first transparent heat sink 61 and the display panel 200, so that air can flow through the gap between the first transparent heat sink 61 and the display panel 200. Thus, the gap between the first transparent heat sink 61 and the display panel 200 can form a heat dissipation channel to reduce the heat transfer from the first dimming component 100 to the display panel 200, avoid the display panel 200 from thermal expansion and deformation, and avoid the first polarizer 32 in the second dimming component 300 from thermal deformation.

[0176] The first transparent heat sink 61 can be formed of a material with a high coefficient of thermal expansion and good heat dissipation characteristics. For example, the first transparent heat sink 61 can be made of sapphire glass.

[0177] In one example, the coefficient of thermal expansion of the first transparent heat sink 61 may be less than the coefficient of thermal expansion of the first light-transmitting substrate 11.

[0178] In one example, the thickness of the first transparent heat sink 61 can be less than the thickness of the first light-transmitting substrate 11, so as to reduce the thickness of the entire display module and reduce the path length of light emitted from the first light-transmitting substrate 11, thereby reducing light loss.

[0179] In this example, when a second transparent heat sink 62 is included, the second transparent heat sink 62 may be located on the side of the second dimming assembly 300 closer to the display panel 200. For example, the second dimming assembly 300 includes a second light-transmitting substrate 31 and a first polarizer 32, wherein the first polarizer 32 may be located on the side of the second light-transmitting substrate 31 opposite to the display panel 200, or on the side of the second light-transmitting substrate 31 closer to the display panel 200.

[0180] In one example, the first polarizer 32 is located on the side of the second light-transmitting substrate 31 facing away from the display panel 200, and the second transparent heat sink 62 can be attached to the side of the second light-transmitting substrate 31 closest to the display panel 200 and in contact with the second light-transmitting substrate 31. To avoid optical path difference caused by phase difference, the refractive index of the second transparent heat sink 62 can be the same as the refractive index of the second light-transmitting substrate 31.

[0181] In one example, such as Figure 6 As shown, the first polarizer 32 is located on the side of the second transparent substrate 31 closest to the display panel 200, and the second transparent heat sink 62 can be attached to the side of the first polarizer 32 closest to the display panel 200 and in contact with the first polarizer 32. To avoid optical path difference caused by phase difference, the refractive index of the second transparent heat sink 62 can be the same as the refractive index of the first polarizer 32.

[0182] Among them, such as Figure 6As shown, there may be a gap between the second transparent heat sink 62 and the display panel 200, so that air can flow in the gap between the second transparent heat sink 62 and the display panel 200. Thus, the gap between the second transparent heat sink 62 and the display panel 200 can form a heat dissipation channel to reduce the heat transfer from the display panel 200 to the second dimming component 300 and prevent the first polarizer 32 in the second dimming component 300 from being deformed by heat.

[0183] The second transparent heat sink 62 can be formed of a material with a high coefficient of thermal expansion and good heat dissipation characteristics. For example, the second transparent heat sink 62 can be made of sapphire glass.

[0184] In one example, the coefficient of thermal expansion of the second transparent heat sink 62 can be less than that of the second transparent substrate 31. Thus, when the second transparent heat sink 62 is in contact with the first polarizer 32, the problem of the second transparent heat sink 62 deforming due to heat and causing the first polarizer 32 to deform due to heat can be avoided.

[0185] In one example, the thickness of the second transparent heat sink 62 can be less than the thickness of the second light-transmitting substrate 31 to reduce the overall thickness of the display module.

[0186] In some embodiments, when a first transparent heat sink 61 and a second transparent heat sink 62 are included, the thickness of the first transparent heat sink 61 may be greater than the thickness of the second transparent heat sink 62.

[0187] In some embodiments, when including a first transparent heat sink 61 and / or a second transparent heat sink 62, at least a portion of the gap region between the first dimming component 100 and the display panel 200 includes a first air duct; and / or, at least a portion of the gap region between the second dimming component 300 and the display panel 200 includes a second air duct.

[0188] In one example, such as Figure 7 As shown, it may include a first transparent heat sink 61, and a first air duct may be provided between the first transparent heat sink 61 and the display panel 200, and a second air duct may be provided between the second dimming component 300 and the display panel 200, thereby enhancing the heat dissipation capacity from the first dimming component 100 to the display panel 200, reducing the optical path difference through the second dimming component 300, and improving the heat dissipation capacity between the display panel 200 and the second dimming component.

[0189] In one example, such as Figure 8As shown, it may include a first transparent heat sink 61 and a first air duct, and a second transparent heat sink 62 is provided between the second dimming component 300 and the display panel 200. In this way, the heat dissipation capability from the first dimming component 100 to the display panel 200 is enhanced, and the optical path difference through the second dimming component 300 can be reduced (this example is not shown in the figure).

[0190] In another example, a first air duct may be included, and a second transparent heat sink 62 may be disposed between the second dimming component 300 and the display panel 200 (this example is not shown in the figure).

[0191] In another example, such as Figure 9 As shown, it may include a first transparent heat sink 61, and a second air duct is provided between the second dimming component 300 and the display panel 200. In this way, the heat dissipation capacity of the second dimming component 300 to the display panel 200 is enhanced, the heat dissipated to the first polarizer 32 is reduced, and the problem of change of optical path difference caused by thermal deformation of the first polarizer 32 is effectively avoided.

[0192] In another example, such as Figure 10 As shown, it may include a first transparent heat sink 61, and a second transparent heat sink 62 and a second air duct are provided between the second dimming component 300 and the display panel 200. In this way, the heat dissipation capacity of the second dimming component 300 to the display panel 200 is enhanced, the heat dissipated to the first polarizer 32 is further reduced, and the problem of change of optical path difference caused by thermal deformation of the first polarizer 32 is effectively avoided.

[0193] In this embodiment, when a first air duct and a second air duct are included, the size of the first air duct can be larger than the size of the second air duct in the normal direction of the display panel 200.

[0194] For example, when including a first transparent heat sink 61 and a second transparent heat sink 62, the size of the first air duct can be 2mm-10mm, and the size of the second air duct can be 2mm-10mm. For example, the size of the first air duct can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. For example, the size of the second air duct can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0195] The ratio of the first air duct to the second air duct can be 1 to 2. For example, the size of the first air duct is 2mm and the size of the second air duct can be 2mm; for example, the size of the first air duct is 3mm and the size of the second air duct can be 2mm; for example, the size of the first air duct is 4mm and the size of the second air duct can be 3mm; for example, the size of the first air duct is 5mm and the size of the second air duct can be 3mm.

[0196] In this embodiment, when the size of the first air duct is larger than the size of the second air duct, the heat dissipation intensity of the light-incident side of the display panel 200 can be improved, thereby avoiding the deformation caused by the thermal expansion of the display panel 200, and thus reducing the optical path difference between the display panel 200 and the second dimming component 300.

[0197] In some embodiments, the distance between the first dimming component 100 and the display panel 200 is 2mm-20mm, and the distance between the second dimming component 300 and the display panel 200 is 2mm-20mm.

[0198] For example, the distance between the first dimming component 100 and the display panel 200 can be 2mm, 4mm, 6mm, 8mm, 9mm, 10mm, 15mm, 18mm, or 20mm.

[0199] For example, the distance between the second dimming component 300 and the display panel 200 can be 2mm, 4mm, 5mm, 7mm, 10mm, 12mm, 16mm, 17mm, or 20mm.

[0200] In one example, the distance between the first dimming component 100 and the display panel 200 can be 9mm, and the distance between the second dimming component 300 and the display panel 200 can be 7mm.

[0201] In one example, the ratio between the distance between the first dimming component 100 and the display panel 200 and the distance between the second dimming component 300 and the display panel 200 can be 1.1 to 1.3. For example, it can be 1.1, 1.2, or 1.3.

[0202] In some embodiments, the array substrate 21 in the display panel 200 may be close to the second dimming component 300, for example, as Figures 1-10 As shown, the array substrate 21 is located between the color filter substrate 22 and the second dimming component 300, and the color filter substrate 22 is located between the first dimming component 100 and the array substrate 21.

[0203] In this way, the light first passes through the color filter substrate 22 and then through the array substrate 21. The light-shielding layer 221 on the color filter substrate 22 can partially block the incident light. The light enters the array substrate 21 through the opening 222 of the light-shielding layer 221, and the amount of light transmission is controlled by the liquid crystal on the array substrate 21. In this way, light leakage can be avoided and the projection brightness and contrast can be improved.

[0204] In this example, the problem of altered characteristics caused by backlighting of the active layer 217 of the thin-film transistor in the pixel driving circuit of the array substrate 21 can also be avoided, thus ensuring the characteristics of the thin-film transistor. In this way, the thin-film transistor can be a bottom-gate structure or a top-gate structure.

[0205] The thin-film transistor can be a polycrystalline silicon transistor or an oxide transistor.

[0206] The following examples illustrate several display modules of this utility model.

[0207] Example 1

[0208] Please refer to Figure 1 and Figure 11 As shown, the first dimming component 100 of the display module includes a first light-transmitting substrate 11 and a multilayer reflective brightness enhancement film 12; the second dimming component 300 includes a second light-transmitting substrate 31 and a first polarizer 32; the display panel 200 includes a color filter substrate 22, an array substrate 21 and a liquid crystal layer 301 located between the color filter substrate 22 and the array substrate 21.

[0209] Among them, the multilayer reflective brightness enhancement film 12 is located on the side of the first light-transmitting substrate 11 away from the display panel 200, the color filter substrate 22 is located on the side of the array substrate 21 close to the first dimming component 100, and the first polarizer 32 is located on the side of the second light-transmitting substrate 31 close to the display panel 200.

[0210] In particular, in the normal direction of the display surface of the display panel 200, the distance between the first light-transmitting substrate 11 and the color filter substrate 22 is greater than the distance between the first polarizer 32 and the array substrate 21.

[0211] A first air duct is formed between the first light-transmitting substrate 11 and the color filter substrate 22, and a second air duct is formed between the first polarizer 32 and the array substrate 21. In the normal direction of the display surface of the display panel 200, the size of the first air duct is 9mm and the size of the second air duct is 7mm.

[0212] like Figure 11 As shown, the first polarizer 32 includes a first polarizing layer 323 and first support layers located on opposite sides of the first polarizing layer 323. Both first support layers are zero-phase film layers.

[0213] The display module using Example 1 features a multilayer reflective brightness enhancement film 12 with excellent transmittance, providing superior optical performance. Utilizing its high reflectivity, it performs polarization cycling, reducing light loss and thus improving image quality. Its brightness can be increased by more than 10%, and its temperature resistance exceeds 110°C, offering greater reliability.

[0214] In the display module of Example 1, the first polarizer 32 is attached to the light-incident side of the second light-transmitting substrate 31. Light transmitted from the display panel 200 first passes through the first polarizer 32 and then through the second light-transmitting substrate 31, reducing the optical path difference and altering the propagation path length of the polarized light. This suppresses dark-state unevenness and improves image display. Furthermore, separating the first polarizer 32 from the display panel 200 creates a distance between them, reducing the heat transferred directly from the display panel 200 to the first polarizer 32. This distributes the heat evenly across the surfaces of the display panel 200 and the second light-transmitting substrate 31, significantly increasing the heat dissipation area and reducing the degree of deformation of the first polarizer 32 due to high temperatures. The second airflow channel formed between the first polarizer 32 and the display panel 200 further enhances heat dissipation performance and effectively blocks heat transfer. This avoids the depolarization phenomenon caused by local overheating of the first polarizer 32, thereby improving the uneven display caused by the uneven performance of the first polarizer 32, and making the brightness and color of the picture more uniform.

[0215] Using the display module of Example 1, since the two first support layers have the same refractive index in at least two spatial directions in the three-dimensional space of the display panel, the phase difference of the light passing through the second dimming component 300 is reduced, thereby further reducing the optical path difference and optimizing the display effect.

[0216] Example 2

[0217] Please refer to Figure 2 and Figure 11 As shown, this display module differs from the display module in Example 1 in that the multilayer reflective brightness enhancement film 12 is located on the side of the first light-transmitting substrate 11 close to the display panel 200.

[0218] Using the display module of Example 2 can reduce the optical path difference before light enters the display panel 200, further improving the display effect and unevenness in dark states.

[0219] Example 3

[0220] Please refer to Figure 3 and Figure 11 As shown, the display module differs from the display module of Example 1 in that the first dimming component 100 includes a polarizing brightness enhancement film 14 and a second polarizer 13; wherein the polarizing brightness enhancement film 14 and the second polarizer 13 are located on the same side of the first light-transmitting substrate 11 and are both located on the side of the first light-transmitting substrate 11 away from the display panel 200.

[0221] Using the display module of Example 3, light passes through the first Fresnel lens 400, then through the polarizing brightening film 14, then through the second polarizer 13, and enters the first light-transmitting substrate 11. After passing through the display panel 200, it passes through another first polarizer 32 and the second light-transmitting substrate 31. This reduces the optical path difference before the light enters the display panel 200, while passing through a second polarizer 13 to improve the contrast and further improve the display effect and dark unevenness.

[0222] Using the display module in Example 3, the contrast is improved by approximately 50%.

[0223] Example 4

[0224] Please refer to Figure 4 and Figure 11 As shown, the display module differs from the display module of Example 3 in that the polarizing brightness enhancement film 14 is located on the side of the first light-transmitting substrate 11 away from the display panel 200, the second polarizer 13 is located on the side of the first light-transmitting substrate 11 close to the display panel 200, and the first polarizer 32 is located on the side of the second light-transmitting substrate 31 away from the display panel 200.

[0225] In the display module of Example 4, a polarizing brightening film 14 is attached to the light-incident side of the first light-transmitting substrate 11, and a second polarizer 13 is attached to the light-emitting side of the first light-transmitting substrate 11. While improving the contrast, the optical path difference of the first light-transmitting substrate 11 is reduced, thereby improving the display effect and dark unevenness.

[0226] Example 5

[0227] Please refer to Figure 5 and Figure 11 As shown, this display module differs from the display module in Example 4 in that the first polarizer 32 is located on the side of the second light-transmitting substrate 31 closer to the display panel 200.

[0228] In the display module of Example 4, the first polarizer 32 is attached to the light-incident side of the second light-transmitting substrate 31, which can further reduce the optical path difference on the second light-transmitting substrate 31 side and further improve the display effect and dark state unevenness.

[0229] Example 6

[0230] like Figure 6 As shown, unlike the display module in Example 1, a first transparent heat sink 61 is provided on the side of the first dimming component 100 near the display panel 200, and a second transparent heat sink 62 is provided on the side of the second dimming component 300 near the display panel 200.

[0231] The first transparent heat sink 61 has a first air duct between it and the display panel 200, and the second transparent heat sink 62 has a second air duct between it and the display panel 200.

[0232] In the direction of the normal to the display surface of the display panel 200, the size of the first air duct is larger than the size of the second air duct.

[0233] In the above six examples, the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be borosilicate glass. The thickness of the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be 0.5 mm to 2.0 mm. The thickness of the first light-transmitting substrate 11 is greater than the thickness of the second light-transmitting substrate 31. For example, the thickness of the first light-transmitting substrate 11 can be 1.5 mm and the thickness of the second light-transmitting substrate 31 can be 1 mm.

[0234] In the above six examples, the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be borosilicate glass. The thickness of the first light-transmitting substrate 11 and the second light-transmitting substrate 31 can be 0.5 mm to 2.0 mm. The thickness of the first light-transmitting substrate 11 is greater than the thickness of the second light-transmitting substrate 31. For example, the thickness of the first light-transmitting substrate 11 can be 1.5 mm and the thickness of the second light-transmitting substrate 31 can be 1 mm.

[0235] In the above six examples, the coefficient of thermal expansion of the first transparent substrate 11 can be lower than that of the second transparent substrate 31.

[0236] In the above six examples, the first transparent substrate 11 is bonded to the optical film (multilayer reflective brightening film 12, or polarizing brightening film 14 and second polarizer 13) using a first transparent adhesive 15, and the second transparent substrate 31 is bonded to the first polarizer 32 using a second transparent adhesive 151. Both the first transparent adhesive 15 and the second transparent adhesive 151 can be optical transparent adhesives.

[0237] In one embodiment, a projection device is also provided, please refer to... Figures 16-21 As shown, Figure 16 A front view of an optical stack of a projection device is shown. Figure 17 It shows Figure 16 The image shows an optical stacked cross-sectional view of the projection device. Figure 18 It shows Figure 16 A three-dimensional schematic diagram of the optical stacking of the projection equipment shown; Figure 19 A front view of the optical stack of another projection device is shown. Figure 20 It shows Figure 19 The image shows an optical stacked cross-sectional view of the projection device. Figure 21 It shows Figure 19 The diagram shows a three-dimensional schematic of the optical stacking of the projection device. Figures 16-21 As shown, the projection device includes:

[0238] Second Fosbury 500;

[0239] The first Fresnel lens 400 is positioned opposite to the second Fresnel lens 500;

[0240] A light source assembly is located on the side of the first Fresnel lens 400 opposite to the second Fresnel lens 500; and,

[0241] Figures 1-15 The display module shown in any of the accompanying drawings is located between the second Fresnel lens 500 and the first Fresnel lens 400, and is spaced apart from both the second Fresnel lens 500 and the first Fresnel lens 400.

[0242] In some examples, such as Figure 1 As shown, the distance between the first frosted lens 400 and the first dimming component 100 can be greater than the distance between the second frosted lens 500 and the second dimming component 300. This increases the amount of heat dissipated on the inlet / outlet side of the display panel 200 and reduces the amount of heat reaching the display panel 200 and the second dimming component.

[0243] In some examples, the distance between the first Fenwick lens 400 and the first dimming component 100 can be greater than the distance between the first dimming component 100 and the display panel 200, and the distance between the second Fenwick lens 500 and the second dimming component 300 can be greater than the distance between the second dimming component 300 and the display panel 200. This increases the heat dissipation between the first dimming component 100 and the first Fenwick lens 400, and between the second dimming component 300 and the second Fenwick lens 500.

[0244] like Figures 16-21 As shown, the orthographic projection of the first Fresnel lens 400 onto the plane of the first dimming assembly 100 can overlap with the first dimming assembly 100, such that the orthographic projection of the first Fresnel lens 400 onto the plane of the first dimming assembly 100 can cover the first dimming assembly 100.

[0245] like Figures 16-21 As shown, the orthographic projection of the second Fir lens 500 onto the plane of the second dimming component 300 can overlap with the second dimming component 300, such as... Figures 16-18 As shown, the orthographic projection of the second Faraday lens 500 onto the plane of the second dimming assembly 300 can cover the second dimming assembly 300, or at least coincide with the second dimming assembly 300. For example... Figures 19-21 As shown, the orthographic projection of the second Fresnel lens 500 onto the plane of the second dimming assembly 300 can fall within the second dimming assembly 300.

[0246] like Figures 16-18As shown, in one example, the light source assembly includes a light source 600 and a reflector 700, with the reflector 700 located between the light source 600 and the first Fresnel lens 400. The reflector 700 includes an incident end and an exiting end. The light source 600 is attached to the incident end of the reflector 700. Part of the light emitted by the light source 600 can directly illuminate the first Fresnel lens 400 through the exiting end, while another part of the light is reflected off the inner wall of the reflector 700 and converges to the first Fresnel lens 400, thereby improving light utilization and increasing the brightness of the displayed image.

[0247] like Figures 19-21 As shown, in one example, the light source assembly includes a light source 600, a convex lens 701, and an illumination reflector 702. Light emitted from the light source 600 illuminates the convex lens, which converges the light to improve light utilization. The converged light is then reflected by the illumination reflector to the first Feuerbach 400. The illumination reflector reduces the light transmission path, which helps to reduce the size of the projection device.

[0248] like Figures 16-21 As shown, the projection device may also include an imaging mirror 800 and a lens 900. The imaging mirror 800 is located on one side of the display surface of the display module, and the mirror surface of the imaging mirror 800 has a certain angle with the display surface of the display module, such as... Figures 16-21 As shown, the included angle can be an acute angle.

[0249] The lens 900 is positioned opposite to the imaging mirror 800 and intersects with the imaging mirror 800.

[0250] In this embodiment, the first Fresnel lens 400 integrates the received light into a parallel beam and projects it onto the display module. The light emitted from the display module can be focused by the second Fresnel lens 500 onto the imaging mirror 800, and then reflected by the imaging mirror 800 onto the lens 900 before being magnified and projected onto a plane (e.g., a screen).

[0251] In this embodiment, the projection device may also include a heat dissipation component, which may include at least one cooling fan and heat dissipation fins.

[0252] This may include multiple cooling fans, among which a cooling fan may be located near the light source component.

[0253] The cooling fan may include an air outlet, which may be aligned with the first and second air ducts in the display module, thereby increasing the airflow rate in the first and second air ducts to increase heat dissipation.

[0254] It should be noted that, since the first dimming component 100 and the second dimming component 300 in this embodiment are designed separately from the display panel 200, the heat dissipation power of the cooling fan can be appropriately reduced, saving power consumption. Furthermore, the separate design reduces the heat transferred to the display panel 200 and the second dimming component 300, thereby improving image quality. Therefore, the design of the display module in this embodiment helps to reduce the power consumption of the projection device.

[0255] In some embodiments, the projection device may be a monolithic projection device, that is, it includes an LCD display module.

[0256] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0257] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0258] The above provides a detailed description of a display module and projection device used in the field of projection display provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0259] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0260] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

[0261] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0262] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0263] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0264] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A display module, wherein, The display module includes: A first dimming component (100), a second dimming component (300), and a display panel (200) are arranged at intervals, with the display panel (200) located between the first dimming component (100) and the second dimming component (300); the first dimming component (100) is configured to modulate incident light incident on the display panel (200) into a first ray with a first polarization direction, and the second dimming component (300) is configured to modulate light emitted from the display panel (200) into a second ray with a second polarization direction, wherein the first polarization direction and the second polarization direction are orthogonal; The second dimming component (300) includes a first polarizer (32), which includes a first polarizing layer and a first support layer located on opposite sides of the first polarizing layer. At least one of the first support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel (200).

2. The display module according to claim 1, wherein, The first dimming assembly (100) further includes a second polarizer (13), the second polarizer (13) including a second polarizing layer and a second support layer located on opposite sides of the second polarizing layer; Wherein, at least one of the second support layers has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel (200).

3. The display module according to claim 2, wherein, The first support layer located on both sides of the first polarizer (32) has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel (200); the second support layer located on one side of the second polarizer (13) has the same refractive index in at least two spatial directions in the three-dimensional space of the display panel (200).

4. The display module according to claim 2, wherein, The first dimming component (100) further includes a first light-transmitting substrate (11) and a polarizing brightening film (14). The polarizing brightening film (14) is located on the side of the first light-transmitting substrate (11) away from the display panel (200), and the second polarizer (13) is located on the side of the first light-transmitting substrate (11) close to the display panel (200).

5. The display module according to claim 1, wherein, The first dimming component (100) includes a first light-transmitting substrate (11), and the second dimming component (300) includes a second light-transmitting substrate (31) located on one side of the first polarizer (32). The coefficient of thermal expansion of the first light-transmitting substrate (11) is less than or equal to the coefficient of thermal expansion of the second light-transmitting substrate (31).

6. The display module according to claim 5, wherein, The ratio of the thermal expansion coefficient of the first transparent substrate (11) to that of the second transparent substrate (31) is 0.5 to 1.

7. The display module according to claim 1, wherein, The first dimming component (100) includes a first light-transmitting substrate (11), and the second dimming component (300) includes a second light-transmitting substrate (31) located on one side of the first polarizer (32). The thickness of the first light-transmitting substrate (11) is greater than or equal to the thickness of the second light-transmitting substrate (31).

8. The display module according to claim 7, wherein, The ratio of the thickness of the first light-transmitting substrate (11) to the thickness of the second light-transmitting substrate (31) is 1 to 2.

9. The display module according to claim 7, wherein, The thickness of the first light-transmitting substrate (11) is 0.5mm to 2mm, and the thickness of the second light-transmitting substrate (31) is 0.5mm to 2mm.

10. The display module according to claim 1, wherein, The first dimming component (100) includes a first light-transmitting substrate (11) and an optical film located on one side of the first light-transmitting substrate (11), and a first transparent adhesive (15) is disposed between the optical film and the first light-transmitting substrate (11). The refractive index of the first transparent adhesive (15) is the same as that of the first light-transmitting substrate (11); The optical film includes a multilayer reflective brightening film (12), or the optical film includes a polarizing brightening film (14) and a second polarizer (13).

11. The display module according to claim 1, wherein, The first dimming component (100) includes a first light-transmitting substrate (11), a polarizing brightening film (14), and a second polarizer (13); the polarizing brightening film (14) and the second polarizer (13) are respectively located on opposite sides of the first light-transmitting substrate (11); Wherein, a second transparent adhesive (151) is provided between the polarizing brightening film (14) and the first light-transmitting substrate (11), and a third transparent adhesive (152) is provided between the second polarizer (13) and the first light-transmitting substrate (11). The refractive index of the second transparent adhesive (151) is the same as that of the first light-transmitting substrate (11), and the refractive index of the third transparent adhesive (152) is the same as that of the first light-transmitting substrate (11) or the second polarizer (13).

12. The display module according to claim 1, wherein, The second dimming component (300) includes a second light-transmitting substrate (31) located on the side of the first polarizer (32) facing away from the display panel (200); A fourth transparent adhesive is disposed between the first polarizer (32) and the second light-transmitting substrate (31), and the refractive index of the fourth transparent adhesive is the same as that of the second light-transmitting substrate (31).

13. The display module according to claim 1, wherein, At least a portion of the gap between the first dimming component (100) and the display panel (200) includes a first transparent heat sink (61); and / or, at least a portion of the gap between the second dimming component (300) and the display panel (200) includes a second transparent heat sink (62).

14. The display module according to claim 13, wherein, At least a portion of the gap between the first dimming component (100) and the display panel (200) includes a first air duct; and / or, at least a portion of the gap between the second dimming component (300) and the display panel (200) includes a second air duct.

15. The display module according to claim 14, wherein, Including the first air duct and the second air duct, in the normal direction of the display surface of the display panel (200), the size of the first air duct is larger than the size of the second air duct.

16. The display module according to claim 1, wherein, In the normal direction of the display surface of the display panel (200), the distance between the first dimming component (100) and the display panel (200) is 2mm-20mm, and the distance between the second dimming component (300) and the display panel (200) is 2mm-20mm.

17. The display module according to any one of claims 1-16, wherein, The first dimming component (100) includes a first light-transmitting substrate (11), a polarizing brightness enhancement film (14) located on the side of the first light-transmitting substrate (11) away from the display panel (200), and a second polarizer (13) located on the side of the first light-transmitting substrate (11) close to the display panel (200); the second dimming component (300) includes a second light-transmitting substrate (31). The second polarizer (13) is located on the side of the polarizing brightening film (14) close to the display panel (200), and the first polarizer (32) is located on the side of the second light-transmitting substrate (31) close to the display panel (200).

18. The display module according to any one of claims 1-16, wherein, The first dimming component (100) includes a first light-transmitting substrate (11) and a multilayer reflective brightness enhancement film (12) located on the side of the first light-transmitting substrate (11) near the display panel (200); the second dimming component (300) includes a second light-transmitting substrate (31). The first polarizer (32) is located on the side of the second light-transmitting substrate (31) close to the display panel (200).

19. The display module according to any one of claims 1-16, wherein, The display panel (200) includes a color filter substrate (22), an array substrate (21), and a liquid crystal layer (301) located between the color filter substrate (22) and the array substrate (21). The array substrate (21) is located between the color filter substrate (22) and the second dimming component (300), and the color filter substrate (22) is located between the first dimming component (100) and the array substrate.

20. A projection device, wherein, include: First Philo lens (400); The second Fresnel lens (500) is positioned opposite to the first Fresnel lens (400); A light source assembly is located on the side of the first Fresnel lens (400) opposite to the second Fresnel lens (500); and, The display module according to any one of claims 1-19, wherein the display module is located between the second Fresnel lens (500) and the first Fresnel lens (400), and is spaced apart from both the second Fresnel lens and the first Fresnel lens (400); The light source component is located on the side of the first dimming component (100) away from the display panel (200).

Images