Display module and projection device

Abstract

The utility model relates to the technical field of display equipment, and discloses a display module and a projection device. The first polarization unit is located on the light incident side of the display screen, the first polarization unit comprises a first polaroid and a first heat conduction film layer which are arranged in the first direction, and the first direction is the arrangement direction of the first polarization unit and the display screen; the second polarizing unit is located on the light emitting side of the display screen, the second polarizing unit comprises a second polaroid, and the polarizing direction of the second polaroid is perpendicular to the polarizing direction of the first polaroid; the heat conduction frame is arranged around the edges of the display screen, the first polarization unit and the second polarization unit, and the heat conduction frame is in contact with the first heat conduction film layer. The display module can improve the display quality and prolong the display life.

Description

Technical Field

[0001] The utility model relates to the technical field of display equipment, and in particular to a display module and a projection device. Background Art

[0002] At present, the main projector technologies with market scale and relatively mature technology are DLP projection technology, LCD projection technology, and LCOS projection technology. Among them, the imaging principle of LCD projection display is to use light source to project onto the liquid crystal display panel, and synthesize a color image by independently controlling the transmittance of light by the liquid crystal in each pixel of the liquid crystal display panel, and then project the color image onto the display plane through a projection assembly composed of a reflective lens, a collimating lens, etc., to achieve image projection. Liquid crystal projection displays have the advantages of low cost, small size of optical machine, and simple principle, and are widely used in more and more places.

[0003] During the projection process of LCD projection displays, due to the limitations of the LCD display principle, the light emitted by the light source will pass through the polarizer, display screen, and polarizer in sequence before it can be modulated into the corresponding projection image. Only a small part of the light emitted by the light source can be effectively used for image presentation. In addition, in order to improve projection clarity and enhance daytime visibility, LCD projection displays usually use extremely high-brightness light sources, and high-brightness light sources often cause high heat. The excessive heat generated by the projection display during operation directly affects the service life and display performance of the components. Utility Model Content

[0004] The utility model provides a display module and a projection device. The display module can improve display quality and display life.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] A display module, comprising:

[0007] Display screen;

[0008] a first polarizing unit, the first polarizing unit being located at a light incident side of the display screen, the first polarizing unit comprising a first polarizer and a first heat conductive film layer arranged along a first direction, the first direction being an arrangement direction of the first polarizing unit and the display screen;

[0009] a second polarizing unit, the second polarizing unit being located at a light-emitting side of the display screen, the second polarizing unit comprising a second polarizer, and a polarization direction of the second polarizer being perpendicular to a polarization direction of the first polarizer;

[0010] A heat-conducting frame is arranged around edges of the display screen, the first polarizing unit and the second polarizing unit, and the heat-conducting frame is in contact with the first heat-conducting film layer.

[0011] Optionally, the first polarizing unit is attached to the display screen.

[0012] Optionally, a first heat dissipation channel is provided between the first polarizing unit and the display screen;

[0013] The first polarizing unit further includes a first transparent substrate;

[0014] The first polarizer and the first heat-conducting film layer are attached to the first transparent substrate.

[0015] Optionally, the polarizer is located on a side of the first transparent substrate facing away from the display screen.

[0016] Optionally, the first heat-conducting film layer is located on a side of the first transparent substrate facing away from the display screen; or,

[0017] The first heat-conducting film layer is located on a side of the first transparent substrate facing the display screen.

[0018] Optionally, the first polarizer is attached via the first heat-conductive film layer.

[0019] Optionally, the display screen includes a display area and a non-display area arranged around the display area;

[0020] The first heat-conducting film layer includes at least one opening, and the orthographic projection of the opening on the display screen is located in the display area.

[0021] Optionally, the second polarizing unit is attached to the display screen.

[0022] Optionally, a second heat dissipation channel is provided between the second polarizing unit and the display screen;

[0023] The second polarizing unit further includes a second transparent substrate;

[0024] The second polarizer is attached to the second transparent substrate.

[0025] Optionally, the second polarizing unit further includes a second heat-conducting film layer, the second heat-conducting film layer and the second polarizer are arranged along a first direction, and the second heat-conducting film layer is in contact with the heat-conducting frame.

[0026] Optionally, the second polarizer is attached via the first heat-conductive film layer.

[0027] Optionally, an anti-reflection layer is further included, and the anti-reflection layer is located on a side of the first polarizing unit facing the display screen and / or a side of the second polarizing unit facing the display screen;

[0028] The anti-reflection layer comprises a first film layer and a second film layer which are alternately stacked along a second direction, wherein the second direction is a direction in which the first polarizing unit points to the second polarizing unit;

[0029] The material of the first film layer is silicon nitride material, and the material of the second film layer is silicon oxide material.

[0030] Optionally, the anti-reflection layer includes a bottom layer film, a second layer film, a second top layer film and a top layer film arranged along the second direction, and the thickness ratio of the bottom layer film, the second layer film, the second top layer film and the top layer film is 1: (1 to 2): (2.5 to 4.5): (2 to 4.5).

[0031] Optionally, the bottom layer film has a thickness of 10 nm to 20 nm, the second layer film has a thickness of 20 nm to 40 nm, the second top layer film has a thickness of 90 nm to 110 nm, and the top layer film has a thickness of 80 nm to 90 nm.

[0032] The utility model also provides a projection device, comprising any one of the display modules provided in the above technical solutions, and also comprising a light source, a focusing element, an optical lens, a reflector and a light projection element;

[0033] The light source is located at the light incident side of the display module;

[0034] The light focusing element is located between the light source and the display module;

[0035] The optical lens is located at the light-emitting side of the display module;

[0036] The reflector is located at the light-emitting side of the optical lens, and is used to reflect the light emitted from the optical lens onto the light-projecting element.

[0037] The utility model provides a display module and a projection device, wherein the display module comprises a display screen, a first polarizing unit, a second polarizing unit and a heat-conducting frame; wherein the first polarizing unit is located at the light incident side of the display screen, and the second polarizing unit is located at the light exit side of the display screen; when the light incident side of the display module is irradiated with a high-brightness light source, since the first polarizing unit has a first heat-conducting film layer, and the heat-conducting frame is arranged around the edges of the display screen, the first polarizing unit and the second polarizing unit, the heat-conducting frame is in contact with the first heat-conducting film layer, and a heat conduction path can be formed through the first heat-conducting film layer and the heat-conducting frame, and heat is quickly transferred to the heat-conducting frame at the periphery of the module through the first heat-conducting film layer, thereby accelerating the heat dissipation speed, effectively reducing the temperature of the display area of ​​the module, avoiding bending and wrinkling of the polarizing film caused by uneven accumulation of heat on the polarizing film, thereby being able to eliminate the resulting display unevenness and overheating of the display screen, and improving the display quality and display life of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a liquid crystal projector in the related art;

[0039] Figures 2 to 8 A schematic diagram of the structure of a display module provided by an embodiment of the utility model;

[0040] Fig. 9 A schematic plan view of a display module provided by an embodiment of the utility model;

[0041] Fig.10 for Fig. 9 Cross-sectional view at AA in the middle;

[0042] Fig.11 A schematic plan view of a display module provided by an embodiment of the utility model;

[0043] Fig.12 for Fig.11 Cross-section at the middle BB;

[0044] Fig.13 , Fig.14 A schematic diagram of the structure of a display module provided by an embodiment of the utility model;

[0045] Fig.15 A schematic diagram of the structure of an anti-reflection layer provided in an embodiment of the utility model;

[0046] Fig.16 The present invention is a schematic structural diagram of a projection device provided in an embodiment of the present invention.

[0047] icon:

[0048] 1-display screen; 2-first polarizing unit; 21-first polarizer; 22-first heat-conducting film layer; 23-first transparent substrate; 3-second polarizing unit; 31-second polarizer; 32-second transparent substrate; 33-second heat-conducting film layer; 4-heat-conducting frame; 41-first contact portion; 42-second contact portion; 5-anti-reflection layer; 51-first film layer; 52-second film layer; 501-bottom film; 502-second film; 503-sub-top film; 504-top film;

[0049] 100 - display module; 200 - light source; 300 - focusing element; 400 - optical lens; 500 - reflector; 600 - projection element. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] In the related art, the structure of the liquid crystal projector can be as follows: Figure 1 As shown, Figure 1 The liquid crystal projector is composed of a light source 01, a focusing element 02, a liquid crystal display module, an optical lens 04, a reflector 05, and a light projection element 06. In the liquid crystal projector, the light emitted by the light source is gathered by the focusing element and transmitted to the display area of ​​the liquid crystal display module. The display area of ​​the liquid crystal display module is composed of an upper polarizer 032, a lower polarizer 033, and a liquid crystal display screen 031. The light from the light source 01 is converted into linearly polarized light by the lower polarizer 033. The linearly polarized light is deflected by the pixel liquid crystal in the liquid crystal display screen 032, carrying the image grayscale information, and then colored by the color film layer of the liquid crystal display screen 032 and presented in grayscale by the upper polarizer, forming a target display image. The final image is projected out of the projector through the light projection element 06, and a clear image is formed on the target projection surface.

[0052] In order to prevent the heat of the light source / power source from accumulating in the projector, especially in the display area of ​​the LCD screen, the upper polarizer 032 and the lower polarizer 033 can be attached to the transparent substrate 034 separately and at a certain distance from the LCD screen 031, so as to form an air circulation channel between the LCD screen 031 and the polarizers. The fan can drive the air to flow through the air circulation channel to remove the heat. This solution has inherent defects:

[0053] The effect of heat dissipation by air circulation is limited. The main materials of the LCD screen and polarizer that play a dimming role are alkali-free glass and polyvinyl alcohol (PVA), both of which are not good thermal conductivity materials. The heat inside them cannot be quickly and effectively conducted to the surface and carried away by the air. When working for a long time in an environment with poor heat dissipation, the heat accumulates unevenly inside the polarizer, causing the polarizer film to bend and wrinkle, affecting the modulation of polarized light by the polarizer, causing black state light leakage, and reducing display contrast.

[0054] In order to solve the above technical problems, the present utility model provides a display module, such as Figures 2 to 8 As shown, including:

[0055] Display screen 1;

[0056] A first polarizing unit 2, which is located at the light incident side of the display screen 1. The first polarizing unit 2 includes a first polarizer 21 and a first heat-conducting film layer 22 arranged along a first direction. The first direction is the arrangement direction of the first polarizing unit 2 and the display screen 1;

[0057] A second polarizing unit 3, which is located at the light-emitting side of the display screen 1. The second polarizing unit 3 includes a second polarizer 31. The polarization direction of the second polarizer 31 is perpendicular to the polarization direction of the first polarizer 21.

[0058] The heat-conducting frame 4 is disposed around the edges of the display screen 1 , the first polarizing unit 2 , and the second polarizing unit 3 , and the heat-conducting frame 4 is in contact with the first heat-conducting film layer 22 .

[0059] The display module provided by the above-mentioned utility model embodiment includes a display screen 1, a first polarizing unit 2, a second polarizing unit 3 and a heat-conducting frame 4; wherein the first polarizing unit 2 is located on the light incident side of the display screen 1, and the second polarizing unit 3 is located on the light exiting side of the display screen 1; when the light incident side of the display module is irradiated with a high-brightness light source, since the first polarizing unit 2 has a first heat-conducting film layer 22, and the heat-conducting frame 4 is arranged around the edges of the display screen 1, the first polarizing unit 2 and the second polarizing unit 3, the heat-conducting frame 4 is in contact with the first heat-conducting film layer 22, and a heat conduction path can be formed through the first heat-conducting film layer 22 and the heat-conducting frame 4. Heat is quickly transferred to the heat-conducting frame 4 on the periphery of the module through the first heat-conducting film layer 22, thereby accelerating the heat dissipation speed, effectively reducing the temperature of the display area of ​​the module, and avoiding bending and wrinkling of the polarizer caused by uneven accumulation of heat on the polarizer, thereby being able to eliminate the resulting display unevenness and overheating problems of the display screen 1, and can improve the display quality and display life of the display module.

[0060] In addition, the above-mentioned display module can be applied to a projection device. In the display module, a heat conduction path is formed by the first heat-conducting film layer 22 and the heat-conducting frame 4, which can accelerate the heat dissipation speed and avoid uneven accumulation of heat on the polarizer. Compared with the related art, a fan is not required and sufficient air circulation channels are not required, thereby reducing the overall structure of the projection device and solving the problem of excessive size of the display device.

[0061] Specifically, in order to ensure the transmittance of the first polarizing unit 2 , the first heat-conducting film layer 22 is a transparent film layer.

[0062] The material of the first thermally conductive film layer 22 can be a mixture of a transparent adhesive film, a transparent thermally conductive filler, and other small amounts of accelerators, curing agents, etc. The transparent adhesive film is an organic silicone material, such as a methyl vinyl polysiloxane mixture, a methyl hydrogen polysiloxane mixture, etc. Such materials have relatively good thermal conductivity, a high thermal conductivity after curing, and good bonding strength, good adhesion to components, and can also play an excellent sealing role; the transparent thermally conductive filler can be powdered aluminum nitride, aluminum oxide, silicon oxide, boron nitride, or a carbon-based material (such as graphene, etc.), which has high thermal conductivity and stable electrical properties; the transparent thermally conductive filler can be dispersed inside the transparent adhesive film, and the transparent thermally conductive filler accounts for about 0% to 30% of the total weight of the first thermally conductive film layer 22. A physical thermally conductive network is formed between the transparent thermally conductive fillers, which further improves the thermal conductivity of the first thermally conductive film layer 22. The transparent thermally conductive filler can be a single component, or a mixture of multiple components, which is not limited here.

[0063] Specifically, the display screen 1 is a liquid crystal display panel, which may include an array substrate and a color filter substrate arranged opposite to each other, and a liquid crystal layer located between the array substrate and the color filter substrate, and the array substrate may drive the rotation state of liquid crystal molecules in the liquid crystal layer. The first polarizing unit 2 may be located on a side of the array substrate away from the color filter substrate, and the second polarizing unit 3 may be located on a side of the color filter substrate away from the array substrate.

[0064] Specifically, the material of the heat-conducting frame 4 may be a heat-conducting metal material, for example, aluminum, copper and other metals.

[0065] In a possible implementation, Figure 2 As shown, the first polarizing unit 2 can be directly attached to the display screen 1, which has a simple structure and is easy to manufacture. No air circulation channel or fan is provided between the first polarizing unit 2 and the display screen 1, which can reduce the overall structure of the projection device and avoid the problem of the overall volume of the device being too large.

[0066] Specifically, Figure 2 and Figure 3 As shown, the first thermally conductive film layer 22 can be located between the first polarizer 21 and the display screen 1, and the first polarizer 21 is attached to the display screen 1 through the first thermally conductive film layer 22. In the process of manufacturing the display module, the first thermally conductive film layer 22 can be directly coated on the display screen 1, and then the first polarizer 21 is attached to the side of the first thermally conductive film layer 22 away from the display screen 1, such as Figure 2Alternatively, during the process of manufacturing the display module, the first thermally conductive film layer 22 may be first manufactured on the first polarizer 21, and the pressure-sensitive adhesive layer (PSA) on the first polarizer 21 may be replaced by the first thermally conductive film layer 22, and then the polarizer with the first thermally conductive film layer 22 may be attached to the display screen 1, as shown. Figure 3 shown.

[0067] Optionally, the first heat-conducting film layer 22 may be located between the first polarizer 21 and the display screen 1, such as Figure 4 In the manufacturing process of the display module, the first polarizer 21 can be attached to the display screen 1 first, and then the first thermal conductive film layer 22 is coated on the side of the first polarizer 21 away from the display screen 1 .

[0068] In a possible implementation manner, in order to avoid uneven accumulation of heat emitted by the light source or the display screen 1 on the first polarizer 21 and enhance the heat dissipation effect of the first polarizer unit 2, a first heat dissipation channel may be provided between the first polarizer unit 2 and the display screen 1; the first polarizer unit 2 further includes a first transparent substrate 23; the first polarizer 21 and the first heat-conducting film layer 22 are attached to the first transparent substrate 23, such as Figures 5 to 8 In the first polarizing unit 2, the first polarizing film 21 and the second heat-conducting film layer 33 are attached to the first transparent substrate 23 by setting the first transparent substrate 23, so as to ensure the setting of the heat dissipation channel between the first polarizing unit 2 and the display screen 1. Through the first heat dissipation channel, the heat on the first polarizing film 21 can be dissipated through the air.

[0069] Specifically, the first polarizer 21 and the first heat-conducting film layer 22 may be located on the same side of the first transparent substrate 23, and the positions of the first polarizer 21 and the first heat-conducting film layer 22 along the first direction may be interchangeable. Figure 5 and Figure 6 Optionally, the first polarizer 21 and the first thermally conductive film layer 22 may also be located on different sides of the first transparent substrate 23, which is not shown here, depending on the actual situation, such as Figure 7 shown.

[0070] Specifically, Figures 5 to 7 The first polarizer 21 can be located on the side of the first transparent substrate 23 away from the display screen 1, which can reduce the influence of heat dissipation on the first polarizer 21 when the display screen 1 is working.

[0071] The first heat-conducting film layer 22 may be located on a side of the first transparent substrate 23 away from the display screen 1. Figure 5 and Figure 6 Alternatively, the first heat-conducting film layer 22 may also be located on the side of the first transparent substrate 23 facing the display screen 1, as shown in FIG. Figure 7The first heat-conducting film layer 22 and the heat-conducting frame 4 form a heat conduction path to accelerate the heat dissipation on the first polarizer 21, thereby avoiding the problem of bending and wrinkling of the polarizer film due to uneven accumulation of heat inside the polarizer.

[0072] For example, the first polarizer 21 is located on the side of the first transparent substrate 23 away from the display screen 1, and the first heat-conducting film layer 22 is located on the side of the first polarizer 21 away from the display screen 1. Figure 5 As shown; or, the first polarizer 21 is located on the side of the first transparent substrate 23 away from the display screen 1, and the first thermal conductive film layer 22 is located between the first polarizer 21 and the first transparent substrate 23, as shown Figure 6 As shown; or, the first polarizer 21 is located on the side of the first transparent substrate 23 away from the display screen 1, and the first thermal conductive film layer 22 is located on the side of the first transparent substrate 23 facing the display screen 1, as shown Figure 7 shown.

[0073] Specifically, when the first polarizer 21 and the first heat-conducting film layer 22 are located on the same side of the first transparent substrate 23, the first polarizer 21 can be attached to the first transparent substrate 23 through the first heat-conducting film layer 22. For example, in the process of manufacturing the display module, the first heat-conducting film layer 22 can be directly coated on the first transparent substrate 23, and then the first polarizer 21 is attached to the side of the first heat-conducting film layer 22 away from the first transparent substrate 23, such as Figure 6 Alternatively, during the process of manufacturing the display module, the first thermally conductive film layer 22 may be firstly manufactured on the first polarizer 21, and the pressure-sensitive adhesive layer (PSA) on the first polarizer 21 may be replaced by the first thermally conductive film layer 22, and then the polarizer with the first thermally conductive film layer 22 may be attached to the first transparent substrate 23, as shown. Figure 8 shown.

[0074] In the embodiment of the utility model, the display screen 1 may include a display area and a non-display area arranged around the display area; wherein the first heat-conducting film layer 22 may include at least one opening, and the orthographic projection of the opening on the display screen 1 is located in the display area. Since the provision of the first heat-conducting layer will reduce the transmittance of the display module, the transmittance of the display module can be improved by providing the opening on the first heat-conducting layer.

[0075] Specifically, the first heat-conducting film layer 22 may have an opening, the first heat-conducting film layer 22 is coated in a frame shape, and the orthographic projection of the first heat-conducting film layer 22 on the display screen 1 may be located in the non-display area, such as Fig. 9 and Fig.10 Alternatively, the first heat-conducting film layer 22 may have a plurality of openings distributed in an array, that is, the first heat-conducting film layer 22 is coated in various shapes, and the orthographic projections of the plurality of openings on the display screen 1 are located in the display area, such as Fig.11 and Fig.12 As shown, it can not only speed up the heat dissipation of the first polarizer 21 in the display area to avoid affecting the display effect, but also ensure a good transmittance of the display module.

[0076] Specifically, in order to ensure good contact between the heat-conducting frame 4 and the first heat-conducting film layer 22 and facilitate heat transfer, the heat-conducting frame 4 may have a first contact portion 41, such as Figures 2 to 12 As shown, the first contact portion 41 can contact the edge area of ​​the surface of the first heat-conducting film layer 22 facing the display screen 1 or away from the display screen 1. The orthographic projection of the first contact portion 41 on the display screen 1 is located in the non-display area. In the first polarizing unit 2, when the first heat-conducting film layer 22 is located between two film layers, in order to facilitate the contact between the first contact portion 41 and the first heat-conducting film layer 22, other film layers can avoid the first contact portion 41.

[0077] In the embodiment of the utility model, since the second polarizing unit 3 is far away from the light source, the heat dissipation of the light source has a relatively small effect on it. The second polarizing unit 3 may or may not be provided with a thermal conductive film layer. This is not limited here and depends on actual conditions.

[0078] In a possible implementation, Figures 2 to 4 As shown, the second polarizing unit 3 can be directly attached to the display screen 1, which has a simple structure and is easy to manufacture. No air circulation channel or fan is provided between the second polarizing unit 3 and the display screen 1, which can reduce the overall structure of the projection device and avoid the problem of the overall volume of the device being too large.

[0079] In a possible implementation, in order to accelerate the heat dissipation of the second polarizer 31, a second heat dissipation channel may be provided between the second polarizer unit 3 and the display screen 1; the second polarizer unit 3 further includes a second transparent substrate 32, and the second polarizer 31 may be attached to the second transparent substrate 32, such as Figures 5 to 8 , Fig.13 The heat on the second polarizer 31 can be quickly dissipated into the air through the second heat dissipation channel.

[0080] Specifically, Figures 5 to 8 , Fig.13 As shown, the second polarizer 31 can be located on the side of the second transparent substrate 32 away from the display screen 1, which can reduce the influence of the heat generated by the display screen 1 during operation on the second polarizer 31.

[0081] Specifically, Figures 2 to 4 , Fig.14As shown, the second polarizing unit 3 may further include a second heat-conducting film layer 33, the second heat-conducting film layer 33 and the second polarizer 31 are arranged along the first direction, and the second heat-conducting film layer 33 is connected to the heat-conducting frame 4. A heat conduction path may be formed through the second heat-conducting film layer 33 and the heat-conducting frame 4, and the heat on the second polarizer 31 may be transferred to the heat-conducting frame 4 through the second heat-conducting film layer 33, and then dissipated into the air, which can accelerate the heat dissipation speed of the second polarizer 31.

[0082] The material of the second heat-conducting film layer 33 may be the same as that of the first heat-conducting film layer 22 .

[0083] Specifically, when the second polarizing unit 3 includes the second thermally conductive film layer 33, and the second polarizer 31 and the second thermally conductive film layer 33 are directly attached to the display screen 1, the second thermally conductive film layer 33 can be located between the second polarizer 31 and the display screen 1. Figure 2 and Figure 3 Alternatively, the second heat-conducting film layer 33 may be located on the side of the second polarizer 31 away from the display screen 1, as shown in FIG. Figure 4 shown.

[0084] The second polarizer 31 can be attached to the display screen 1 through the second thermal conductive film layer 33. At this time, the second thermal conductive film layer 33 can be coated on the display screen 1 alone, and the second polarizer 31 is attached to the side of the second thermal conductive film layer 33 away from the display screen 1. Figure 2 Alternatively, the second thermally conductive film layer 33 may replace the original pressure-sensitive adhesive layer (PSA) on the second polarizer 31 and be coated on the second polarizer 31. The second polarizer 31 with the second thermally conductive film layer 33 may be directly attached to the display screen 1. Figure 3 shown.

[0085] Specifically, when the second polarizer 31 includes the second thermally conductive film layer 33, and the second polarizer 31 and the second thermally conductive film layer 33 are attached to the second transparent substrate 32, the second polarizer 31 and the second thermally conductive film layer 33 can be located on the same side of the second transparent substrate 32, such as Fig.14 As shown, alternatively, the second polarizer 31 and the second thermal conductive film layer 33 can be located on both sides of the second transparent substrate 32 .

[0086] When the second polarizer 31 and the second heat-conductive film layer 33 are located on the same side, the second polarizer 31 can be attached to the second transparent substrate 32 through the second heat-conductive film layer 33, the second heat-conductive film layer 33 can be coated on the second transparent substrate 32 alone, the second polarizer 31 is attached to the second heat-conductive film layer 33 away from the second transparent substrate 32, the second heat-conductive film layer 33 can also replace the original pressure-sensitive adhesive layer (PSA) on the second polarizer 31, and be coated on the second polarizer 31, and the second polarizer 31 with the second heat-conductive film layer 33 can be directly attached to the second transparent substrate 32.

[0087] In the embodiment of the utility model, in order to make the heat-conducting frame 4 and the second heat-conducting film layer 33 in good contact and facilitate heat transfer, the heat-conducting frame 4 may have a second contact portion 42, and the second contact portion 42 may contact the edge area of ​​the surface of the second heat-conducting film layer 33 facing the display screen 1 or away from the display screen 1, and the orthographic projection of the second contact portion 42 on the display screen 1 is located in the non-display area, such as Figures 2 to 4 , Fig.14 In the second polarizing unit 3 , when the second heat-conducting film layer 33 is located between two film layers, in order to facilitate the second contact portion 42 to contact the second heat-conducting film layer 33 , other film layers may avoid the second contact portion 42 .

[0088] Specifically, Figure 2 and Figure 3 As shown, when the first heat-conducting film layer and the second heat-conducting film layer are both attached to the display screen, the first contact portion and the second contact portion may be the same contact portion.

[0089] In the embodiment of the utility model, the first polarizing unit 2, the second polarizing unit 3 and the display screen 1 are separated to form a heat dissipation channel. A reflective interface is added inside the display module. Excessive reflection will interfere with the normal display of the display module, reduce the transmittance of the display module, and affect the imaging effect of the display module.

[0090] In the embodiment of the utility model, in order to improve the transmittance of the display module and improve the imaging effect of the display module, the display module may further include an anti-reflection layer 5, such as Figures 5 to 8 As shown, the anti-reflection layer 5 is located on the side of the first polarizing unit 2 facing the display screen 1 and / or the side of the second polarizing unit 3 facing the display screen 1; wherein, Fig.15 As shown, the anti-reflection layer 5 may include a first film layer 51 and a second film layer 52 that are alternately stacked along a second direction, and the second direction is the direction in which the first polarizing unit 2 points to the second polarizing unit 3; the material of the first film layer 51 is silicon nitride (SiN x ) material, and the material of the second film layer 52 is silicon oxide (SiO2) material.

[0091] Specifically, when the first polarizing unit 2 is separated from the display screen 1 and the first polarizer 21 is independently carried by the first transparent substrate 23 and is not directly attached to the display screen 1, in order to optimize the projection optical display effect, a low-reflection treatment can be provided on the first transparent substrate 23. For example, an anti-reflection layer 5 can be provided on the side of the first polarizing unit 2 facing the display panel. The anti-reflection layer 5 can effectively reduce the reflectivity of the light on the surface of the first transparent substrate 23, thereby improving the light transmittance of the display module and reducing the interference of the reflected light on the projection imaging.

[0092] When the second polarizing unit 3 is separated from the display screen 1 and the second polarizer 31 is independently carried by the second transparent substrate 32 and is not directly attached to the display screen 1, in order to optimize the projection optical display effect, a low-reflection treatment can be provided on the second transparent substrate 32. For example, an anti-reflection layer 5 can be provided on the side of the second polarizing unit 3 facing the display panel. The anti-reflection layer 5 can effectively reduce the reflectivity of the light on the surface of the second transparent substrate 32, thereby improving the transmittance of the light of the display module and reducing the interference of the reflected light on the projection imaging.

[0093] Specifically, the anti-reflection layer 5 may include a first film layer 51 and a second film layer 52 alternately stacked along the second direction. The anti-reflection layer 5 may superimpose and offset the reflected light from the outer film interface with the reflected light from the inner film interface, so that the reflected light is very weak, thereby improving the display effect.

[0094] Specifically, in order to better reduce reflected light, the anti-reflection layer 5 may include a bottom layer film 501, a second layer film 502, a sub-top layer film 503 and a top layer film 504 arranged along the second direction, and the thickness ratio of the bottom layer film 501, the second layer film 502, the sub-top layer film 503 and the top layer film 504 may be 1: (1 to 2): (2.5 to 4.5): (2 to 4.5).

[0095] The bottom layer film 501 and the second top layer film 503 are made of silicon nitride materials, and the second layer film 502 and the top layer film 504 are made of silicon oxide materials.

[0096] Specifically, the bottom layer film 501 may be 10nm to 20nm thick, the second layer film 502 may be 20nm to 40nm thick, the second top layer film 503 may be 90nm to 110nm thick, and the top layer film 504 may be 80nm to 90nm thick, which can better reduce reflected light.

[0097] Specifically, the materials of the first transparent substrate 23 and the second transparent substrate 32 may be transparent inorganic materials, such as glass, or transparent organic materials, such as plastic.

[0098] Based on the structure of the anti-reflection layer 5, the inventors of the present application tested the effect of the anti-reflection layer 5, and the test results can be shown in Table 1. It can be seen from Table 1 that when only the anti-reflection layer 5 is set on the transparent substrate (method one), the measured regular reflection (SCI) of the film surface of the anti-reflection layer 5 can be achieved below 5%, and when a polarizer (POL) is also attached to the transparent substrate, the measured regular reflection (SCI) of the film surface of the anti-reflection layer 5 can be achieved below 3%. The setting of the anti-reflection layer 5 can effectively reduce the reflectivity of the surface of the transparent substrate.

[0099] Table 1

[0100]

[0101] The present utility model also provides a projection device, including any one of the display modules 100 provided in the above technical solutions, such as Fig.16 As shown, it also includes a light source 200, a focusing element 300, an optical lens 400, a reflector 500 and a light projecting element 600;

[0102] The light source 200 is located at the light incident side of the display module 100;

[0103] The light focusing element 300 is located between the light source 200 and the display module 100;

[0104] The optical lens 400 is located at the light-emitting side of the display module 100;

[0105] The reflector 500 is located at the light-emitting side of the optical lens 400 , and is used to reflect the light emitted by the optical lens 400 onto the light-projecting element 600 .

[0106] The projection device provided by the embodiment of the utility model includes a display module 100, a light source 200, a focusing element 300, an optical lens 400, a reflector 500 and a light projection element 600, wherein the light source 200 is located on the light incident side of the display module 100 and is used to provide incident light for the display module 100, the focusing element 300 focuses the light emitted by the light source 200 to the light incident side of the display module 100, and the display module 100 can display the target display image, the optical lens 400 is used to project the light emitted by the optical module onto the reflector 500, and the reflector 500 can project the light emitted by the optical lens 400 The light is reflected onto the light-projecting element 600, which can project the target display image out of the projection device to form a clear image on the target projection surface. Since a heat conduction path can be formed in the display module through the first heat-conducting film layer 22 and the heat-conducting frame 4, the heat is quickly transferred to the heat-conducting frame 4 at the periphery of the module through the first heat-conducting film layer 22, thereby accelerating the heat dissipation speed, effectively reducing the temperature of the display area of ​​the module, and avoiding bending and wrinkling of the polarizer caused by uneven accumulation of heat on the polarizer, thereby eliminating the resulting display unevenness and overheating problems of the display screen 1, and improving the display quality and display life of the projection device.

[0107] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A display module, characterized in that: include: Display screen; a first polarizing unit, the first polarizing unit being located at a light incident side of the display screen, the first polarizing unit comprising a first polarizer and a first heat conductive film layer arranged along a first direction, the first direction being an arrangement direction of the first polarizing unit and the display screen; a second polarizing unit, the second polarizing unit being located at a light-emitting side of the display screen, the second polarizing unit comprising a second polarizer, and a polarization direction of the second polarizer being perpendicular to a polarization direction of the first polarizer; A heat-conducting frame is arranged around the edges of the display screen, the first polarizing unit and the second polarizing unit, and the heat-conducting frame is in contact with the first heat-conducting film layer.

2. The display module according to claim 1, characterized in that: The first polarizing unit is attached to the display screen.

3. The display module according to claim 1, characterized in that: A first heat dissipation channel is provided between the first polarizing unit and the display screen; The first polarizing unit further includes a first transparent substrate; The first polarizer and the first heat-conducting film layer are attached to the first transparent substrate.

4. The display module according to claim 3, characterized in that: The first polarizer is located on a side of the first transparent substrate facing away from the display screen.

5. The display module according to claim 4, characterized in that: The first heat-conducting film layer is located on a side of the first transparent substrate facing away from the display screen; or, The first heat-conducting film layer is located on a side of the first transparent substrate facing the display screen.

6. The display module according to any one of claims 2 to 4, characterized in that: The first polarizer is attached through the first heat-conductive film layer.

7. The display module according to claim 1, characterized in that: The display screen includes a display area and a non-display area arranged around the display area; The first heat-conducting film layer includes at least one opening, and the orthographic projection of the opening on the display screen is located in the display area.

8. The display module according to claim 1, characterized in that: The second polarizing unit is attached to the display screen.

9. The display module according to claim 1, characterized in that: A second heat dissipation channel is provided between the second polarizing unit and the display screen; The second polarizing unit further includes a second transparent substrate; The second polarizer is attached to the second transparent substrate.

10. The display module according to claim 8 or 9, characterized in that: The second polarizing unit further includes a second heat-conducting film layer, the second heat-conducting film layer and the second polarizer are arranged along a first direction, and the second heat-conducting film layer is in contact with the heat-conducting frame.

11. The display module according to claim 10, characterized in that: The second polarizer is attached through the first heat-conductive film layer.

12. The display module according to claim 1, characterized in that: It also includes an anti-reflection layer, which is located on a side of the first polarizing unit facing the display screen and / or a side of the second polarizing unit facing the display screen; The anti-reflection layer comprises a first film layer and a second film layer which are alternately stacked along a second direction, wherein the second direction is a direction in which the first polarizing unit points to the second polarizing unit; The material of the first film layer is silicon nitride material, and the material of the second film layer is silicon oxide material.

13. The display module according to claim 12, characterized in that: The anti-reflection layer includes a bottom layer film, a second layer film, a second top layer film and a top layer film arranged along the second direction, and the thickness ratio of the bottom layer film, the second layer film, the second top layer film and the top layer film is 1: (1 to 2): (2.5 to 4.5): (2 to 4.5).

14. The display module according to claim 13, characterized in that: The thickness of the bottom layer film is 10nm to 20nm, the thickness of the second layer film is 20nm to 40nm, the thickness of the second top layer film is 90nm to 110nm, and the thickness of the top layer film is 80nm to 90nm.

15. A projection device, characterized in that: A display module comprising any one of claims 1 to 14, further comprising a light source, a focusing element, an optical lens, a reflector and a light projection element; The light source is located at the light incident side of the display module; The light focusing element is located between the light source and the display module; The optical lens is located at the light-emitting side of the display module; The reflector is located at the light-emitting side of the optical lens, and is used to reflect the light emitted from the optical lens onto the light-projecting element.

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