Display module and display device

Abstract

The invention provides a display module and a display device. The display module comprises a display panel. The heat dissipation film is located on the backlight side of the display panel, and the heat dissipation film comprises a metal layer; the polaroid is located on the light emitting side of the display panel and comprises a light-transmitting conducting layer, the light-transmitting conducting layer is located on the side, close to the display panel, of the polaroid, and a built-in electric field is formed between the light-transmitting conducting layer and the metal layer. According to the display module, the built-in electric field is formed through the conductive layer and the metal layer, and electrostatic balance is realized between the built-in electric field and an external electric field according to an electric field superposition principle, so that electrostatic charges accumulated in the back film are released, electrostatic charge accumulation is effectively reduced, the problem of low-gray-scale display abnormity of a curved-surface display product is solved, and the display quality of the curved-surface display product is improved. And the display effect, the quality and the product competitiveness of the display module are improved.

Description

Technical Field

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

[0002] At present, curved display products have low grayscale display anomalies such as green and shiny, which hinder their wide-scale market promotion. Studies have found that during the use of the display module, the surface of the protective layer (such as the cover glass) may generate static electricity due to friction and other reasons, which is conducted and accumulated in the back film, causing an electrostatic field to be generated inside the display module, affecting the characteristics of the transistor, which may lead to the above-mentioned low grayscale display anomaly problem. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a display module and a display device, in which a built-in electric field is formed between the metal layer of the heat dissipation film and the light-transmitting conductive layer of the polarizer, and the built-in electric field and the external electric field offset each other, thereby effectively avoiding the accumulation of static charge in the back film, which is beneficial to improving the problem of low grayscale display abnormalities in display products, and further ensuring that the display module has a good display effect, thereby improving the product yield and enhancing product competitiveness.

[0004] In a first aspect, the present invention provides a display module, comprising:

[0005] Display panel;

[0006] A heat dissipation film, the heat dissipation film is located on the backlight side of the display panel, and the heat dissipation film layer includes a metal layer;

[0007] The polarizer is located on the light-emitting side of the display panel. The polarizer includes a light-transmitting conductive layer. The light-transmitting conductive layer is located in a region of the polarizer close to the display panel. A built-in electric field is formed between the light-transmitting conductive layer and the metal layer.

[0008] As an optional solution, the polarizer further includes a pressure-sensitive adhesive layer, and the light-transmitting conductive layer is formed by doping semiconductor metal and / or semiconductor metal oxide in the pressure-sensitive adhesive layer.

[0009] As an optional solution, the resistance of the light-transmitting conductive layer is greater than or equal to 2×10 9 Europe and less than or equal to 2×10 11 Europe.

[0010] As an optional solution, the polarizer further includes a pressure-sensitive adhesive layer, and the light-transmitting conductive layer is stacked and arranged on a side of the pressure-sensitive adhesive layer close to the display panel;

[0011] The light-transmitting conductive layer includes a semiconductor metal or a semiconductor metal oxide, preferably metal arsenic.

[0012] As an optional solution, the display panel has a bending area, and the orthographic projection of the light-transmitting conductive layer on the display panel is at least located in the bending area.

[0013] As an optional solution, the orthographic projection of the light-transmitting conductive layer on the display panel completely covers the display panel.

[0014] As an optional solution, the display module further includes a back film, the back film is located on the backlight side of the display panel, and the heat dissipation film is located on the side of the back film away from the display panel;

[0015] In a direction parallel to the display panel, at least one edge of the light-transmitting conductive layer protrudes from the edge of the back film, and at least one edge of the back film protrudes from the edge of the metal layer, so that after the display module is bonded, at least one edge of the light-transmitting conductive layer contacts the back film, and at least one edge of the back film contacts the metal layer.

[0016] As an optional solution, a carbonized cutting edge is formed on at least one side of the display module, the light-transmitting conductive layer is connected to the back film through the carbonized cutting edge, and the back film is connected to the metal layer through the carbonized cutting edge.

[0017] As an optional solution, the display module further includes a cover plate, which is bonded to a side of the polarizer away from the display panel by optical adhesive.

[0018] In a second aspect, the present invention provides a display device, comprising the display module of the first aspect.

[0019] In the display module of the present invention, the heat dissipation film includes a metal layer, the polarizer includes a light-transmitting conductive layer, and the light-transmitting conductive layer is located in the area of ​​the polarizer close to the display panel. When an external electric field exists outside the display module, the charges on the protective film in the display module move freely and are redistributed in the metal layer and the light-transmitting conductive layer. In this way, a built-in electric field is formed between the metal layer and the light-transmitting conductive layer. According to the principle of field strength superposition, the internal electric field and the external electric field of the display module are superimposed and offset on each other, which is beneficial to overcome the influence of static charge in the display module on the thin film transistor, ensure the characteristic stability of the thin film transistor, thereby improving the anti-static ability of the display module, avoiding the occurrence of green screen, low grayscale greening, flowery screen and other display anomalies in the display module, and further ensuring that the display module has a good display effect, so as to improve the yield rate of the product and improve the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 It is a cross-sectional schematic diagram of a display module in the prior art;

[0022] Figure 2It is a cross-sectional schematic diagram of abnormal lighting of a display module in the prior art;

[0023] Figure 3 It is a cross-sectional schematic diagram of a transparent optical adhesive, a polarizer, and a display panel in a display module of an embodiment of the present application (without a light-transmitting conductive layer);

[0024] Figure 4 This is a first cross-sectional schematic diagram of a transparent optical adhesive, a polarizer, and a display panel in a display module of an embodiment of the present application (a light-transmitting conductive layer is provided);

[0025] Figure 5 A second cross-sectional schematic diagram of a transparent optical adhesive, a polarizer, and a display panel in a display module of an embodiment of the present application (a light-transmitting conductive layer is provided);

[0026] Figure 6 is a cross-sectional schematic diagram of a display module according to an embodiment of the present application;

[0027] Figure 7 It is a cross-sectional schematic diagram of a display module according to an embodiment of the present application.

[0028] In the figure,

[0029] 10. Display panel; 1. Buffer layer; 2. Carbonized cutting edge;

[0030] 20. heat dissipation film, 21. grid glue, 22. support layer, 23. metal layer;

[0031] 30. polarizer, 31. upper protective film, 32. hardness layer, 33. TAC, 34. polarizing layer, 35. first photosensitive adhesive layer, 36. ND film, 37. second photosensitive adhesive layer, 38. light-transmitting conductive layer, 39. lower protective film;

[0032] 40. Transparent optical glue;

[0033] 50. Cover plate;

[0034] 60. Back film, 61. Acryl film, 62. PET film. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

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

[0037] In display modules such as OLED (Organic Light Emitting Diode) products, all organic film materials are polar materials. For example, the base material of the protective film (U-Film) set on the backlight side of the display panel is usually PET (Polyethylene Terephthalate), which is a strong polar material with a electret effect. It works together with the power signal line Vss, resulting in a strong edge electric field E of the product. In addition, for curved display products, after completing the 3D bonding (3D-Lamination) process of the display module, the external film materials of the display panel (PNL) (such as optical adhesive (OCA) overflow, super clean foam-mesh adhesive (SCF-EMBO), foam layer (Foam) overflow) usually exceed the edge of the display panel, increasing the dielectric constant of the edge position of the display module, and then increasing the intensity of the edge electric field E, thereby pushing the charge in the base substrate of the display panel to the gate of the transistor, so that the channel of the transistor is opened, causing the abnormal area to be brighter when displayed at low grayscale (such as Figure 2 As shown, static charges are distributed in the back film 60 and the buffer layer 1, and the charge transmission between the source and the drain increases). Due to the stable retention characteristics of PET after polarization, even if the charge on the cover surface is eliminated later, the electric field still exists (such as Figure 1 shown).

[0038] Based on the above problems, Figure 3-7 As shown, an embodiment of the present invention provides a display module, comprising:

[0039] Display panel 10;

[0040] A heat dissipation film 20 , which is located on the backlight side of the display panel 10 , and the heat dissipation film 20 includes a metal layer 23 ;

[0041] The polarizer 30 is located at the light-emitting side of the display panel 10 . The polarizer 30 includes a light-transmitting conductive layer 38 . The light-transmitting conductive layer 38 is located in a region of the polarizer 30 close to the display panel 10 . A built-in electric field is formed between the light-transmitting conductive layer 38 and the metal layer 23 .

[0042] It can be understood that the display panel 10 can be a flexible display panel 10, for example, it can be an organic light emitting diode (OLED) display panel 10 or a quantum dot organic light emitting diode (QLED), etc., and it can be set according to the needs of the actual application scenario, and the embodiments of the present application do not limit this.

[0043] The display panel 10 includes a substrate and a driving layer, a display layer and an encapsulation layer arranged on the substrate; wherein the side of the substrate away from the principle display layer can be the backlight layer of the display panel 10, and the side of the display layer away from the substrate can be the light emitting side of the display panel 10.

[0044] In some embodiments, the substrate may be a flexible substrate, and the flexible substrate may include, for example, a PET substrate, a PEN (Polyethylene naphthalate diformic acid glycol ester) substrate, or a PI substrate. It should be noted that the substrate may be a one-layer structure or a multi-layer structure. For example, the substrate may include at least one flexible substrate and at least one buffer layer, and the flexible substrate and the buffer layer are alternately stacked.

[0045] The driving layer includes a plurality of pixel driving circuits distributed in an array. The pixel driving circuit may include electronic components such as a plurality of transistors and capacitors. For example, each pixel driving circuit may include three transistors and one capacitor, forming a 3T1C (i.e., one driving transistor, two switching transistors and one capacitor). It may also include more than three transistors and at least one capacitor, such as a 4T1C (i.e., one driving transistor, three switching transistors and one capacitor), a 5T1C (i.e., one driving transistor, four switching transistors and one capacitor) or a 7T1C (i.e., one driving transistor, six switching transistors and one capacitor), etc. Among them, the transistor may be a thin film transistor (TFT for short).

[0046] It can be understood that the thin film transistor may include a control electrode, a first electrode and a second electrode, wherein the control electrode is the gate electrode of the thin film transistor, the first electrode is one of the source electrode and the drain electrode of the thin film transistor, and the second electrode is the other of the source electrode and the drain electrode of the thin film transistor.

[0047] In some embodiments, the driving layer may include an active layer, a first gate metal layer (Gate1), a second gate metal layer (Gate2), a first metal wiring layer (SD1), and a second metal wiring layer (SD2), and these film layers are configured to form thin film transistors, capacitors, and a plurality of signal lines for pixel driving in a pixel driving circuit. For example, the plurality of signal lines may include: a power signal line, a data signal line, a reset signal line, a scan signal line, an enable signal line, and an initialization signal line. The driving layer may also include an insulating layer separating these film layers.

[0048] Among them, the display layer may include: a light-emitting device layer and an encapsulation layer. The light-emitting device layer is stacked on the side of the driving layer away from the substrate. The light-emitting device layer may include: a pixel defining layer and a plurality of light-emitting devices. The pixel defining layer has a plurality of pixel openings, and one pixel opening defines the position of a light-emitting device. For example, the light-emitting device may be an OLED light-emitting device or a QLED light-emitting device. Taking the OLED light-emitting device as an example, in the direction away from the substrate, the light-emitting device may include a first electrode, a light-emitting layer, and a second electrode stacked in sequence. Of course, the light-emitting device may also include at least one of a hole injection layer, a hole transport layer, and an electron blocking layer disposed between the first electrode and the light-emitting layer, and at least one of an electron injection layer, an electron transport layer, and a hole blocking layer disposed between the second electrode and the light-emitting layer; in some embodiments, the first electrode may be an anode, and the second electrode may be a cathode. Among them, the structure of the anode may be a composite structure composed of a transparent conductive oxide film / metal film / transparent conductive oxide film stacked in sequence. Among them, the material of the above-mentioned transparent conductive oxide film is, for example, any one of ITO (Indium tin oxide) and IZO (Indium zinc oxide), and the material of the above-mentioned metal film is, for example, any one of gold (Au), silver (Ag), nickel (Ni) and platinum (Pt). For another example, the structure of the anode can also be a single-layer structure, and the material of the single-layer structure can be any one of ITO, IZO, Au, Ag, Ni, and Pt. Each pixel opening exposes a portion of the anode of the corresponding light-emitting device, and at least a portion of the light-emitting layer is located in the corresponding pixel opening and is electrically connected to the corresponding anode. For example, the cathodes of each light-emitting device can be electrically connected to each other to form an integrated structure. For example, the material of the cathode can be any one of aluminum (Al), silver (Ag) and magnesium (Mg), or any one of a magnesium-silver alloy and an aluminum-lithium alloy.

[0049] The encapsulation layer is arranged on the side of the light-emitting device layer away from the substrate to protect the light-emitting device. The encapsulation layer may include a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer. For example, the first inorganic encapsulation layer and the second inorganic encapsulation layer may be made of inorganic materials such as nitrides, oxides, nitrogen oxides, nitrates, carbides or any combination thereof, and the preparation process may adopt a chemical vapor deposition (CVD) process, such as a plasma enhanced chemical vapor deposition (PECVD) process. For example, the organic insulating layer may be made of materials such as acrylic, hexamethyldisiloxane, polyacrylates, polycarbonates, polystyrene, etc., and the preparation process may adopt an inkjet printing (IJP) process.

[0050] In some embodiments, the display panel 10 further includes a color filter layer, which is disposed on a side of the encapsulation layer away from the substrate. The color filter layer may include a first color filter unit, a second color filter unit, and a third color filter unit. The first color filter unit, the second color filter unit, and the third color filter unit are color filter units of different colors. The first color filter unit, the second color filter unit, and the third color filter unit may have different thicknesses or the same thickness, or two of them may have the same thickness and the other may have a different thickness;

[0051] In some other embodiments, adjacent color filter units of the color film layer do not overlap each other, and the color film layer also includes a black matrix arranged between adjacent color filter units to absorb ambient light, reduce ambient light reflection of the display panel 10, and realize that the screen is dark when it is turned off. Of course, in other embodiments, the first color filter unit and the second color filter unit may have a first overlapping area, the second color filter unit and the third color filter unit may have a second overlapping area, and the third color filter unit and the first color filter unit may have a third overlapping area. When two filter units of different colors overlap, the light transmittance of the overlapping area is low, so it can be used as a black matrix, so that the first overlapping area, the second overlapping area, and the third overlapping area of ​​the display panel 10 can all be used as a black matrix to achieve a light shielding effect without the need to set up an additional black matrix.

[0052] In some embodiments, the display panel 10 may further include a touch layer for realizing a touch function. The touch layer may be disposed between the encapsulation layer and the color filter layer to realize an in-screen touch structure, which is beneficial for reducing the thickness of the display panel 10. Of course, in other embodiments, the touch layer may also be disposed at other positions of the display panel 10200, and the embodiments of the present application are not limited thereto.

[0053] It can also be understood that the heat dissipation film 20 is arranged on the backlight side of the display panel 10, specifically, the heat dissipation film 20 is located on the side of the substrate away from the driving layer. The heat dissipation film 20 can be made of a super clean foam (SCF) composite film; of course, the heat dissipation film 20 can also be made of a multi-layer laminated structure, wherein the heat dissipation film 20 includes a metal layer 23, the metal layer 23 has heat dissipation performance and conductive performance, and the metal layer 23 can generally be made of metal copper (Cu) or metal aluminum (Al); the heat dissipation film 20 can also include an adhesive layer and a functional layer located between the adhesive layer and the metal layer 23, the adhesive layer is used to bond the heat dissipation film 20 to the backlight side of the display panel 10, the adhesive layer can be made of mesh glue 21 (embossing, referred to as EMBO) or other adhesive materials, the mesh glue 21 is conducive to reducing bubbles generated when bonding with the display panel 10, thereby enhancing the connection strength between the display panel 10 and the heat dissipation film 20. During actual use, a protective film layer is provided on the side of the adhesive layer of the heat dissipation film 20 that is away from the metal layer 23, which is used to protect the film layer. When using the heat dissipation film 20, the protective film layer needs to be peeled off first; the functional layer has a stress buffering property, which can buffer the stress and impact applied to the display panel 10 by the outside; specifically, the functional layer may include a foam layer (Foam), which is provided on the side of the adhesive layer close to the metal layer 23, and the material of the foam layer may be polyurethane (PU for short) or other materials; in some other embodiments, the functional layer may also include a supporting layer 22, which is provided on the side of the foam layer close to the metal layer 23 to play a supporting and impact-resistant role, and the supporting layer 22 may be black to enhance the integrated black effect of the product, and the supporting layer 22 may be black PI (Polyimide).

[0054] It can also be understood that the polarizer 30 is disposed on the light-emitting side of the display panel 10, and the polarizer 30 is mainly used to shield the emission of ambient light irradiated into the interior of the display panel, thereby achieving an anti-reflection effect. Figure 3-5 As shown, the polarizer 30 may include a hardness layer 32 (Hard Coating, HC), TAC33 (triacetate), a polarizing layer 34 (polyvinyl alcohol, PVA), a first photosensitive adhesive layer 35 (Pressure Sensitive Adhesive, PSA), an ND film 36 and a second photosensitive adhesive layer 37 (PSA) which are stacked in sequence; of course, in actual use, the polarizing layer 34 also includes an upper protective film 31 and a lower protective film 39, the upper protective film 31 is arranged above the hardness layer 32, and the lower protective film 39 is arranged below the second photosensitive adhesive layer 37. When the polarizer 30 is installed on the display panel 10, it is necessary to tear off the upper protective film 31 and the lower protective film 39 first, and then attach the second photosensitive adhesive layer 37 to the display panel 10.

[0055] For example, the resistance of the upper protective film 31 of the conventional polarizer 30 and the resistance of the second photosensitive adhesive are both greater than 10 12 respectively, adding a light-transmitting conductive layer 38 (such as) on the side of the hardness layer 32 of the polarizer 30 away from the display panel 10 Figure 4 As shown in Scheme A, a light-transmitting conductive layer 38 is added to the side of the second photosensitive adhesive layer 37 of the polarizer 30 close to the display panel 10 (as shown in Scheme B). Figure 5 As shown, the difference between scheme B and scheme C is that the resistance of the light-transmitting conductive layer 38 is different), the resistance of the upper protective film 31 side and the resistance of the second photosensitive adhesive layer 37 side of the polarizer 30 are adjusted respectively, and the polarizer 30 is assembled into a display module for testing. The test results are shown in Table 1;

[0056] Table 1 Test results of conventional polarizer and optimized polarizer 30

[0057]

[0058]

[0059] It can be seen from Table 1 that the copper rod test results of Scheme B and Scheme C are good, but the reliability of Scheme C is unqualified (sulfur corrosion exists).

[0060] In an embodiment of the present application, the polarizer 30 includes a light-transmitting conductive layer 38, which is located in the area of ​​the polarizer 30 close to the display panel 10. Specifically, the light-transmitting conductive layer 38 is arranged on a side of the second photosensitive adhesive layer 37 close to the display panel 10 or is located in the second photosensitive adhesive layer 37. In this way, when the display module is in an external electric field, it is beneficial for the static charge of the display module to move to the light-transmitting conductive layer 38 and the metal layer 23 in the heat dissipation film 20, thereby forming a built-in electric field between the light-transmitting conductive layer 38 and the metal layer 23. According to the principle of field strength superposition, the built-in electric field and the external electric field cancel each other out, thereby overcoming the influence of static charge in the display module on the thin film transistor, ensuring the characteristic stability of the thin film transistor, thereby improving the anti-static ability of the display module, and avoiding the problem of low grayscale display abnormality in the display module.

[0061] The light-transmitting conductive layer 38 has certain conductivity and can avoid blocking light, thereby ensuring the display effect of the display module.

[0062] The display module of the embodiment of the present application solves the problem of abnormal display of the existing display module at low grayscale. In the display module of the embodiment of the present application, the heat dissipation film 20 includes a metal layer 23, and the polarizer 30 includes a light-transmitting conductive layer 38, and the light-transmitting conductive layer 38 is located in the area of ​​the polarizer 30 close to the display panel 10. When there is an external electric field outside the display module, the charges on the protective film in the display module move freely and are redistributed in the metal layer 23 and the light-transmitting conductive layer 38. In this way, a built-in electric field is formed between the metal layer 23 and the light-transmitting conductive layer 38. According to the principle of field superposition, the internal electric field and the external electric field of the display module are superimposed and offset each other, thus overcoming the influence of static charge on the thin film transistor in the display module, ensuring the characteristic stability of the thin film transistor, thereby improving the antistatic ability of the display module, avoiding the occurrence of green screen, low grayscale greening, flowery screen and other display abnormalities in the display module, and then ensuring that the display module has a good display effect, so as to improve the product yield and product competitiveness.

[0063] As an achievable manner, the polarizer 30 further includes a pressure-sensitive adhesive layer, and the light-transmitting conductive layer 38 is formed by doping semiconductor metal and / or semiconductor metal oxide into the pressure-sensitive adhesive layer.

[0064] As described above, the polarizer 30 includes two pressure-sensitive adhesive layers, one of which is used to bond the polarizing layer 34 and the ND film 36, and the other is used to ensure that the polarizer 30 is reliably attached to the display panel 10. Therefore, the light-transmitting conductive layer 38 is arranged on the side of the pressure-sensitive adhesive layer in the polarizer 30 close to the display panel 10.

[0065] In actual processing, semiconductor metals and / or semiconductor metal oxides can be doped into the pressure-sensitive adhesive layer to form a light-transmitting conductive layer 38; this embodiment is beneficial to reducing the resistance of the pressure-sensitive adhesive layer and improving the conductivity, and at the same time can ensure that the polarizer 30 and the display panel 10 are reliably bonded, and there is no need to set up a light-transmitting conductive layer 38 separately, which simplifies the processing technology, facilitates preparation, and is beneficial to improving production efficiency.

[0066] Usually the resistance of the pressure sensitive adhesive layer is greater than 10 12 Europe.

[0067] In a preferred embodiment, after the pressure-sensitive adhesive layer is doped with semiconductor metal or semiconductor metal oxide, the resistance of the pressure-sensitive adhesive layer (light-transmitting conductive layer) is greater than or equal to 2×10 9 Europe and less than or equal to 2×10 11 Europe.

[0068] In this embodiment, the resistance of the pressure-sensitive adhesive layer is reliably reduced, thereby improving the charge conduction performance of the pressure-sensitive adhesive layer, which is beneficial to better conduct the static charge in the display module to the pressure-sensitive adhesive layer and to form a built-in electric field, thereby achieving the release of static charge.

[0069] In some other embodiments, the polarizer 30 further includes a pressure-sensitive adhesive layer, and the light-transmitting conductive layer 38 is stacked and disposed on a side of the pressure-sensitive adhesive layer close to the display panel 10;

[0070] The light-transmitting conductive layer 38 includes a semiconductor metal or a semiconductor metal oxide, preferably metal arsenic.

[0071] In this embodiment, the light-transmitting conductive layer 38 is laminated on the side of the pressure-sensitive adhesive layer close to the display panel 10 and has good charge conduction performance, thereby reliably realizing the release of static charges in the display module.

[0072] It is understandable that the light-transmitting conductive layer 38 may be made of, but not limited to, metal oxides such as TiO2, SnO2, In2O3, ITO, and ATO; the light-transmitting conductive layer 38 may be made of, but not limited to, metals such as silicon, germanium, and arsenic.

[0073] As an achievable manner, the display panel 10 has a bending region, and the orthographic projection of the light-transmitting conductive layer 38 on the display panel 10 is at least located in the bending region.

[0074] It can be understood that during the 3D curved surface bonding process, the layers in the display module bend along with the bending area of ​​the display panel 10, which will cause the film layers outside the display panel 10 to be staggered on the bending side, thereby increasing the electric field strength at the edge. The positive projection of the light-transmitting conductive layer 38 on the display panel 10 is at least located in the bending area. During the bending process, it is beneficial for the light-transmitting conductive layer 38 and the metal layer 23 to respectively contact the layers generating static charge in the display module, which is beneficial for the static charge to be transferred to the light-transmitting conductive layer 38 and the metal layer 23 under the action of the external electric field, thereby forming a built-in electric field between the light-transmitting conductive layer 38 and the metal layer 23 to release the static charge of the display module.

[0075] This implementation is beneficial to ensuring charge conduction, thereby reliably forming a built-in electric field.

[0076] In a preferred embodiment, the orthographic projection of the light-transmitting conductive layer 38 on the display panel 10 completely covers the display panel 10 .

[0077] In this example, the orthographic projection of the light-transmitting conductive layer 38 on the display panel 10 completely covers the display panel 10, which is beneficial to ensure that the static charge in various parts of the display module is released, thereby reliably improving the problem of abnormal low grayscale display of the display module and ensuring the display effect of the display module.

[0078] In some embodiments, the thickness of the light-transmitting conductive layer 38 may be 2 nm-10 nm, which ensures conductive properties while facilitating processing and does not affect the thickness of the entire display module.

[0079] As an achievable manner, the display module further includes a back film 60 , the back film 60 is located on the backlight side of the display panel 10 , and the heat dissipation film 20 is located on the side of the back film 60 away from the display panel 10 ;

[0080] In a direction parallel to the display panel 10, at least one edge of the light-transmitting conductive layer 38 protrudes from the edge of the back film 60, and at least one edge of the back film 60 protrudes from the edge of the metal layer 23, so that after the display module is bonded, at least one edge of the light-transmitting conductive layer 38 contacts the back film 60, and at least one edge of the back film 60 contacts the metal layer 23.

[0081] It is understandable that the back film 60 may be a U-Film film, which is attached to the backlight side of the display panel 10 and is mainly used to protect and support the display panel 10. The back film 60 may include a laminated acrylic film (Acryl film 61) and a polyethylene terephthalate film (PET film 62), wherein PET is a highly polar material with an electret effect, which easily causes static charge accumulation.

[0082] It should be noted that, in a direction parallel to the display panel 10, at least one edge of the light-transmitting conductive layer 38 protrudes from the edge of the back film 60, which can be understood as the edge of the back film 60 is retracted relative to the edge of the light-transmitting conductive layer 38, and at least one edge of the back film 60 protrudes from the edge of the metal layer 23, which can be understood as the edge of the metal layer 23 is retracted relative to the edge of the back film 60; wherein, at least one edge of the light-transmitting conductive layer 38, at least one edge of the back film 60 and the edge of the metal layer 23 may be on the same side in a direction parallel to the display panel 10.

[0083] In this embodiment, when the display module is 3D bonded, it is beneficial for the light-transmitting conductive layer 38 and the back film 60 to contact, and the back film 60 and the metal layer 23 to contact, thereby facilitating the transfer of charges in the back film 60 to the light-transmitting conductive layer 38 and the metal layer 23. A built-in electric field is formed between the light-transmitting conductive layer 38 and the metal layer 23, which is superimposed and offset by the external electric field, thereby avoiding the problem of abnormal low grayscale display in the display module.

[0084] As an achievable method, Figure 6 As shown, a carbonized cutting edge 2 is formed on at least one side of the display module, the light-transmitting conductive layer 38 is connected to the back film 60 through the carbonized cutting edge 2 , and the back film 60 is connected to the metal layer 23 through the carbonized cutting edge 2 .

[0085] It can be understood that the carbonized cutting edge 2 refers to the cutting edge formed by laser cutting of the display module. Since the laser cutting process generates carbonized debris, the carbonized debris forms a carbonized path at the cutting edge, thereby connecting the light-transmitting conductive layer 38 and the back film 60, and the back film 60 and the metal layer 23, thereby conducting the static charge generated by the polarization of PET in the back film 60 to the metal layer 23 and the light-transmitting conductive layer 38 respectively, thereby greatly weakening the polarization of PET and releasing the static charge.

[0086] In this embodiment, a carbonization path is formed by carbonizing the cutting edge, which has a simple structure and does not require any additional structures. This is beneficial for reliably conducting the static charge generated by PET polarization to the metal layer 23 and the light-transmitting conductive layer 38, thereby improving the display effect of the display module.

[0087] In some embodiments, the display module further includes a cover plate 50 , which is bonded to a side of the polarizer 30 away from the display panel 10 by optical adhesive.

[0088] The cover plate 50 is mainly used to protect the entire display module, and the cover plate 50 is bonded to the side of the polarizer 30 away from the display panel 10 through a transparent optical adhesive 40 (Optically Clear Adhesive). The cover plate 50 can be, but is not limited to, glass or transparent resin material and PET, etc., as long as it has good light transmittance, and the embodiments of the present application do not make specific limitations on this.

[0089] Taking glass as an example, when applied to a curved display product, at least one side of the cover plate 50 is bent, and the lamination of the layers of the display module is achieved through a 3D lamination process.

[0090] In summary, in the display module of the embodiment of the present application, the heat dissipation film 20 includes a metal layer 23, the polarizer 30 includes a light-transmitting conductive layer 38, and the light-transmitting conductive layer 38 is located in the area of ​​the polarizer 30 close to the display panel 10. When there is an external electric field outside the display module, the charges on the protective film in the display module move freely and are redistributed in the metal layer 23 and the light-transmitting conductive layer 38. In this way, a built-in electric field is formed between the metal layer 23 and the light-transmitting conductive layer 38. According to the principle of field superposition, the internal electric field and the external electric field of the display module are superimposed and offset each other, thereby overcoming the influence of static charge on the thin film transistor in the display module, ensuring the characteristic stability of the thin film transistor, thereby improving the anti-static ability of the display module, avoiding the occurrence of green screen, low grayscale greening, flowery screen and other display anomalies in the display module, and then ensuring that the display module has a good display effect, so as to improve the product yield and improve the product competitiveness;

[0091] In addition, by forming a carbonization path through the carbonized cutting edge 2, the metal layer 23 and the back film 60, as well as the back film 60 and the light-transmitting conductive layer 38 can be reliably contacted, and the static charge generated by the polarization of PET in the back film 60 can be conducted out. The result is simple, no additional structures are required, and the processing technology is simplified.

[0092] The display module of the present application is described below through specific embodiments.

[0093] like Figure 6 As shown, the display module includes a display panel 10, a back film 60 and a heat dissipation film 20 are sequentially laminated on the backlight side of the display panel 10 in a direction away from the display panel 10, the back film 60 includes a U-Film-Acryl (Acryl film 61) and a U-Film-PET (PET film 62) laminated in a direction away from the display panel 10, the heat dissipation film 20 includes a grid glue 21, a support layer 22 and a metal layer 23 laminated in a direction away from the display panel 10, a polarizer 30 and a cover plate 50 are laminated on the light-emitting side of the display panel 10 in a direction away from the display panel 10, the cover plate 50 and the polarizer 30 are bonded by a transparent optical glue 40, and a light-transmitting conductive layer 38 is provided on the side of the polarizer 30 close to the display panel 10;

[0094] When the display film group is being tested with a copper rod or when the user is using it, Figure 7 As shown, an external electric field E1 is formed outside the display module, and the PET in the back film 60 generates static charge due to polarization. After laser cutting, the display module becomes a carbonized cutting edge 2, and the carbonized cutting edge 2 connects the PET film and the light-transmitting conductive layer 38, and the PET film and the metal layer 23. Under the action of the external electric field E1, the charges are redistributed, and the positive charges move to the light-transmitting conductive layer 38, and the negative charges move to the metal layer 23, so as to form a built-in electric field E2 in the opposite direction to the external electric field E1. According to the principle of field strength superposition, the electric field strength inside the display module is equal to the superposition of the outside of E1 and the inside of E2, and the equal and opposite electric fields are superimposed and cancel each other, so that the total electric field strength inside the display module is zero. When the total electric field strength inside the display module is zero, the free electrons in the display module no longer move in a directional manner and are in electrostatic equilibrium, so that the static charge in the PET film is released, thereby avoiding the problem of abnormal low grayscale display of the display module.

[0095] In a second aspect, the present invention provides a display device, comprising the display module of the first aspect. It is understandable that the display device has all the features and advantages of the above display module, which will not be elaborated here. In short, the display device has high quality and yield rate and good display effect.

[0096] The display device is a product with an image display function. For example, the display device may be: a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as business query equipment of e-government, banks, hospitals, power and other departments), a monitor, etc. The display device may also be a microdisplay or a product containing a microdisplay. The product containing a microdisplay may be a smart watch, a smart bracelet, a helmet display, a stereo display mirror, and any of AR devices (such as AR glasses), VR devices (such as VR glasses), etc. For example, a microdisplay may be a display with a display size ranging from about 0.2 inches to about 2.5 inches, but is not limited thereto. It can be understood that the microdisplay may also be a display with a smaller display size, such as a display size less than or equal to 0.2 inches.

[0097] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the panel or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0098] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A display module, characterized in that: include: Display panel; A heat dissipation film, the heat dissipation film is located on the backlight side of the display panel, and the heat dissipation film layer includes a metal layer; A polarizer, the polarizer is located at the light-emitting side of the display panel, the polarizer includes a light-transmitting conductive layer, the light-transmitting conductive layer is located in a region of the polarizer close to the display panel, and a built-in electric field is formed between the light-transmitting conductive layer and the metal layer.

2. The display module according to claim 1, characterized in that: The polarizer also includes a pressure-sensitive adhesive layer, and the light-transmitting conductive layer is formed by doping semiconductor metal and / or semiconductor metal oxide into the pressure-sensitive adhesive layer.

3. The display module according to claim 2, characterized in that: The resistance of the light-transmitting conductive layer is greater than or equal to 2×10 9 Europe and less than or equal to 2×10 11 Europe.

4. The display module according to claim 1, characterized in that: The polarizer further comprises a pressure-sensitive adhesive layer, and the light-transmitting conductive layer is stacked and arranged on a side of the pressure-sensitive adhesive layer close to the display panel; The light-transmitting conductive layer includes semiconductor metal or semiconductor metal oxide, preferably metal arsenic.

5. The display module according to claim 1, characterized in that: The display panel has a bending area, and the orthographic projection of the light-transmitting conductive layer on the display panel is at least located in the bending area.

6. The display module according to claim 5, characterized in that: The orthographic projection of the light-transmitting conductive layer on the display panel completely covers the display panel.

7. The display module according to any one of claims 1 to 6, characterized in that: The display module further comprises a back film, the back film is located on the backlight side of the display panel, and the heat dissipation film is located on a side of the back film away from the display panel; In a direction parallel to the display panel, at least one edge of the light-transmitting conductive layer protrudes from the edge of the back film, and at least one edge of the back film protrudes from the edge of the metal layer, so that after the display module is bonded, at least one edge of the light-transmitting conductive layer contacts the back film, and at least one edge of the back film contacts the metal layer.

8. The display module according to claim 7, characterized in that: A carbonized cutting edge is formed on at least one side of the display module, the light-transmitting conductive layer is connected to the back film via the carbonized cutting edge, and the back film is connected to the metal layer via the carbonized cutting edge.

9. The display module according to any one of claims 1 to 6, characterized in that: The display module further comprises a cover plate, and the cover plate is bonded to a side of the polarizer away from the display panel by optical adhesive.

10. A display device, characterized in that A display module comprising any one of claims 1 to 9.

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