OLED mobile phone display module with gradient heat dissipation buffering and self-repairing functions

Abstract

The invention relates to the technical field of mobile phone display modules, and discloses an OLED mobile phone display module with gradient heat dissipation buffering and self-repairing functions. Comprising a cover plate glass layer, an optical adhesive layer, a polaroid layer, a first heat conduction gel layer, a touch control layer, a second heat conduction gel layer, a display panel, a back plate layer, a third heat conduction gel layer, a gradient heat dissipation buffer layer, a fourth heat conduction gel layer, a graphite heat dissipation layer, a fifth heat conduction gel layer and a metal heat dissipation layer which are stacked in sequence. The first to fifth heat-conducting gel layers are all made of temperature-sensitive self-repairing heat-conducting gel; the gradient heat dissipation buffer layer is a porous silica gel-based gradient pore layer, and the porosity of the gradient heat dissipation buffer layer is gradually increased in the direction away from the backboard layer; and the pores are filled with a mixture of heat-conducting silicone grease and carbon nanotubes. According to the display module, through the arrangement of the anti-interference enhancement layer, the modified PI layer, the gradient heat dissipation buffer layer and the self-repairing embedded layer, the heat dissipation efficiency, the touch control stability and the structural reliability of the whole display module are effectively improved, and the service life of the whole display module is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of mobile phone display module technology, specifically to an OLED mobile phone display module with gradient heat dissipation buffer and self-healing functions. Background Technology

[0002] OLED (Organic Light Emitting Diode) display modules are widely used in the mobile phone industry due to their advantages such as self-illumination and high contrast. Existing OLED mobile phone display modules (as shown in the figure) typically include a cover glass (CG), optical adhesive (OCA), polarizer (POL), thermally conductive gel layer, display panel (containing sub-layers such as DOT, TFE, OLED, TFT, and PI), thermally conductive gel layer, backplane (BP), heat dissipation structure (SCF, containing Foam, Graphite, Copper, and Adhesive layers), driver IC, FPC, touch layer, and light-shielding tape.

[0003] However, existing modules have the following drawbacks: ① The foam layer in the heat dissipation structure (SCF) has good buffering performance but limited heat dissipation capacity, and poor thermal matching with graphite and copper foil, which easily leads to local heat accumulation; ② The electromagnetic interference problem between the touch layer and the surrounding structure has not been fully resolved, affecting touch sensitivity; ③ The adhesive layer is prone to aging and failure after long-term use, leading to interlayer peeling; ④ The mechanical strength and thermal conductivity of the PI layer (polyimide) are insufficient, limiting its protective and heat dissipation assistance for OLED devices. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an OLED mobile phone display module with gradient heat dissipation buffering and self-healing functions, solving the problems of poor heat dissipation and buffering matching, susceptibility to touch interference, easy aging of the adhesive layer, and insufficient performance of the PI layer in existing OLED mobile phone display modules.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An OLED mobile phone display module with gradient heat dissipation buffer and self-healing functions includes a cover glass layer, an optical adhesive layer, a polarizer layer, a first thermally conductive gel layer, a touch layer, a second thermally conductive gel layer, a display panel, a backplate layer, a third thermally conductive gel layer, a gradient heat dissipation buffer layer, a fourth thermally conductive gel layer, a graphite heat dissipation layer, a fifth thermally conductive gel layer, and a metal heat dissipation layer, which are stacked sequentially. The first to fifth thermally conductive gel layers all use temperature-sensitive self-healing thermally conductive gels. The gradient heat dissipation buffer layer is a porous silicone-based gradient pore layer, and its porosity gradually increases in the direction away from the backplate layer. The pores are filled with a mixture of thermally conductive silicone grease and carbon nanotubes.

[0007] Preferably, the temperature-sensitive self-healing thermal conductive gel comprises the following components by weight: 100 parts of acrylate polymer matrix, 20-30 parts of polycaprolactone-based temperature-sensitive repair agent, 5-10 parts of silica nanoparticles, and 2-5 parts of photoinitiator. When the temperature is above 60°C, the polycaprolactone segments soften and undergo molecular chain diffusion, thereby achieving self-repair of interlayer micro-damage.

[0008] Preferably, the silica nanoparticles have a particle size of 20-50 nm.

[0009] Preferably, the porosity of the porous silicone-based gradient pore layer increases from 30% to 70% in the direction away from the backing layer; and the pores are filled with a mixture of thermally conductive silicone grease and 5-10% carbon nanotubes by mass.

[0010] Preferably, an anti-interference enhancement layer is disposed between the polarizing layer and the first thermally conductive gel layer. The anti-interference enhancement layer is a composite layer of silver nanowires and transparent polyimide. The silver nanowires are randomly interwoven and oriented along the direction of touch signal transmission, and are filled in the transparent polyimide matrix.

[0011] Preferably, the surface of the silver nanowires is coated with a titanium dioxide coating with a thickness of 5-10 nm.

[0012] Preferably, the display panel includes a thin-film encapsulation layer, an OLED and a thin-film transistor layer, and a modified PI layer, wherein the modified PI layer is formed by uniformly doping aluminum nitride ceramic particles into PI resin, and an aluminum oxide protective film is formed on the surface of the modified PI layer by atomic layer deposition.

[0013] Preferably, the PI resin contains uniformly doped aluminum nitride ceramic particles with a mass ratio of 15-25% and a particle size of 1-3 μm, and the alumina protective film thickness is 20-50 nm.

[0014] The present invention has the following beneficial effects:

[0015] This OLED mobile phone display module, featuring gradient heat dissipation buffering and self-healing capabilities, utilizes a self-healing thermal conductive gel layer that can self-repair micro-damage under certain temperature triggering conditions. This significantly improves the long-term reliability of interlayer bonding, delays the aging and peeling of the thermal conductive gel layer, and substantially extends the lifespan of the display module. Simultaneously, the gradient porosity design of the gradient heat dissipation buffer layer balances the high thermal conductivity (low porosity, more continuous heat conduction path) near the back panel with the high buffering capacity (high porosity, strong deformation capability) away from the back panel. The thermally conductive silicone grease-carbon nanotube mixture within the pores further enhances heat conduction efficiency, solving the problem of insufficient heat dissipation in traditional foam layers. Overall, this effectively improves the heat dissipation efficiency, touch stability, structural reliability, and lifespan of the entire display module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the display panel structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the anti-interference enhancement layer of the present invention;

[0019] Figure 4 This is a schematic diagram of the modified PI layer of the present invention;

[0020] Figure 5 This is a schematic diagram of the porosity gradient distribution of the gradient heat dissipation buffer layer of the present invention.

[0021] In the diagram: 1. Cover glass layer; 2. Optical adhesive layer; 3. Polarizing film layer; 31. Anti-interference enhancement layer; 311. Composite layer; 312. Silver nanowires; 313. Titanium dioxide coating; 4. First thermally conductive gel layer; 5. Display panel; 51. Thin film encapsulation layer; 52. OLED and thin film transistor layer; 53. Modified PI layer; 531. PI resin; 532. Aluminum nitride ceramic particles; 533. Aluminum oxide protective film; 6. Second thermally conductive gel layer; 7. Backplane layer; 8. Third thermally conductive gel layer; 9. Gradient heat dissipation buffer layer; 91. Porous silicone-based gradient pore layer; 92. Thermally conductive silicone grease and carbon nanotube mixture; 10. Fourth thermally conductive gel layer; 11. Graphite heat dissipation layer; 12. Fifth thermally conductive gel layer; 13. Metal heat dissipation layer; 14. Touch layer. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] An OLED mobile phone display module with gradient heat dissipation buffer and self-healing functions includes a cover glass layer 1, an optical adhesive layer 2, a polarizer layer 3, a first thermally conductive gel layer 4, a touch layer 14, a second thermally conductive gel layer 6, a display panel 5, a backplate layer 7, a third thermally conductive gel layer 8, a gradient heat dissipation buffer layer 9, a fourth thermally conductive gel layer 10, a graphite heat dissipation layer 11, a fifth thermally conductive gel layer 12, and a metal heat dissipation layer 13, which are stacked sequentially. The first to fifth thermally conductive gel layers 12 are all temperature-sensitive self-healing thermally conductive gels. The gradient heat dissipation buffer layer 9 is a porous silicone-based gradient pore layer 91, whose porosity gradually increases in the direction away from the backplate layer 7. The pores are filled with a mixture of thermally conductive silicone grease and carbon nanotubes 92.

[0025] like Figure 1 As shown, in the above technical solution, the self-healing thermally conductive gel layer can achieve micro-damage self-repair under certain temperature triggering, significantly improving the long-term reliability of interlayer bonding, delaying the aging and peeling of the thermally conductive gel layer, and significantly extending the service life of the display module. Simultaneously, the gradient porosity design of the gradient heat dissipation buffer layer 9 balances the high thermal conductivity (low porosity, more continuous heat conduction path) near the backplate side with the high buffering capacity (high porosity, strong deformation capability) far from the backplate side; the thermally conductive silicone grease-carbon nanotube mixture within the pores further enhances heat conduction efficiency, solving the problem of insufficient heat dissipation in traditional foam layers. Overall, this effectively improves the heat dissipation efficiency, touch stability, structural reliability, and service life of the entire display module. In practical applications, the metal heat dissipation layer 13 is made of copper foil / copper alloy.

[0026] The thermosensitive self-healing thermally conductive gel comprises the following components by weight: 100 parts acrylate polymer matrix, 20-30 parts polycaprolactone-based thermosensitive repair agent, 5-10 parts silica nanoparticles, and 2-5 parts photoinitiator. When the temperature exceeds 60°C, the polycaprolactone segments soften and undergo molecular chain diffusion, achieving self-repair of interlayer micro-damage. Figure 1 As shown, in this technical solution, the self-healing thermal conductive gel layer can achieve micro-damage self-repair under temperature triggering, which greatly improves the long-term reliability of interlayer bonding, delays the aging and peeling of the thermal conductive gel layer, and significantly extends the service life of the display module.

[0027] In this technical solution, the particle size of the silica nanoparticles is 20-50nm.

[0028] Example 2

[0029] Within the porous silica-based gradient pore layer 91, the porosity gradually increases from 30% to 70% along the direction away from the backing layer 7; and the pores are filled with a mixture of thermally conductive silicone grease and 5-10% carbon nanotubes by mass. Figure 5As shown, in this technical solution, the gradient porosity design of the gradient heat dissipation buffer layer 9 takes into account both the high thermal conductivity (low porosity, more continuous heat conduction path) near the back plate side and the high buffering capacity (high porosity, strong deformation ability) far from the back plate side; the thermally conductive silicone grease-carbon nanotube mixture in the pores further enhances the thermal conduction efficiency, solving the problem of insufficient heat dissipation of traditional Foam layers.

[0030] Example 3

[0031] An anti-interference enhancement layer 31 is disposed between the polarizer layer 3 and the first thermally conductive gel layer 4. This anti-interference enhancement layer is a composite layer 311 of silver nanowires 312 and transparent polyimide. The silver nanowires 312 are randomly interwoven and oriented along the direction of touch signal transmission, filling the transparent polyimide matrix. The surface of the silver nanowires 312 is coated with a titanium dioxide coating 313 with a thickness of 5-10 nm. Figure 4 As shown, in this technical solution, the directionally arranged silver nanowires 312 (with a titanium dioxide anti-interference coating on the surface) can not only guide the efficient transmission of touch signals, but also shield external electromagnetic interference, significantly improving touch sensitivity and stability.

[0032] Example 4

[0033] The display panel 5 includes a thin-film encapsulation layer 51, an OLED and thin-film transistor layer 52, and a modified PI layer 53. The modified PI layer 53 is formed by uniformly doping aluminum nitride ceramic particles 532 into PI resin 531, and an alumina protective film 533 is formed on the surface of the modified PI layer 53 using atomic layer deposition. Figure 2 and 3 As shown, in this technical solution, the modified PI layer 53 significantly improves thermal conductivity by doping with aluminum nitride ceramic particles 532, which helps dissipate heat from the OLED and thin-film transistor devices; the surface alumina protective film 533 enhances the weather resistance and mechanical strength of the modified PI layer 53, providing more reliable physical protection for the internal OLED structure.

[0034] In this technical solution, the mass percentage of uniformly doped aluminum nitride ceramic particles 532 in PI resin 531 is 15-25%, the particle size is 1-3 μm, and the thickness of the alumina protective film 533 is 20-50 nm.

[0035] The entire display module includes the following molding and testing steps:

[0036] Step 1: Preparation of innovative functional layers

[0037] Anti-interference enhancement layer: Silver nanowires (50nm in diameter and 10um in length) with an 8nm titanium dioxide coating on the surface are oriented and dispersed in a transparent polyimide precursor according to the direction of touch signal transmission. After casting and curing, an anti-interference enhancement layer with a thickness of 15um is obtained.

[0038] Modified PI layer: 20% by mass of aluminum nitride ceramic particles with a particle size of 2 μm are added to PI resin, and after being ultrasonically dispersed evenly, they are coated into a film; then a 30 nm thick dense protective film of alumina is deposited on its surface by atomic layer deposition.

[0039] Gradient heat dissipation buffer layer: A porous silicone layer is prepared by step foaming method. The foaming process is controlled to increase the porosity from 30% near the back plate to 70% away from the back plate. A mixture of "thermal conductive silicone grease + 8% carbon nanotubes by mass" is injected into the pores and then vacuum impregnated and cured.

[0040] Self-healing thermally conductive gel layer: Weigh 100 parts of acrylate polymer matrix, 25 parts of polycaprolactone-based thermosensitive repair agent, 8 parts of silica nanoparticles with a particle size of 30nm, and 3 parts of photoinitiator by weight, stir and mix, and then cure under ultraviolet light to obtain self-healing thermally conductive gel.

[0041] Step 2: Module Assembly

[0042] The following layers are stacked sequentially: cover glass layer → optical adhesive layer → polarizer layer → anti-interference enhancement layer → first self-healing thermal conductive gel layer → touch layer → second self-healing thermal conductive gel layer → display panel layer → modified PI layer → third self-healing thermal conductive gel layer → backplate → gradient heat dissipation buffer layer → fourth self-healing thermal conductive gel layer → graphite heat dissipation layer → fifth self-healing thermal conductive gel layer → metal heat dissipation layer; connect the driver IC to the display panel layer and the FPC to the driver IC; after applying light-shielding tape, the self-healing thermal conductive gel layer is initially cured by hot pressing at 65°C and 0.5MPa, activating the temperature-sensitive repair pre-response, thus obtaining the complete module.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An OLED mobile phone display module with gradient heat dissipation buffering and self-healing functions, characterized in that, It includes a cover glass layer, an optical adhesive layer, a polarizer layer, a first thermally conductive gel layer, a touch layer, a second thermally conductive gel layer, a display panel, a backplate layer, a third thermally conductive gel layer, a gradient heat dissipation buffer layer, a fourth thermally conductive gel layer, a graphite heat dissipation layer, a fifth thermally conductive gel layer, and a metal heat dissipation layer, which are stacked in sequence. The first to fifth thermally conductive gel layers all use temperature-sensitive self-healing thermally conductive gels. The gradient heat dissipation buffer layer is a porous silicone-based gradient pore layer, and its porosity gradually increases in the direction away from the backplate layer. The pores are filled with a mixture of thermally conductive silicone grease and carbon nanotubes.

2. The OLED mobile phone display module with gradient heat dissipation buffer and self-healing function according to claim 1, characterized in that: The thermosensitive self-healing thermal conductive gel comprises the following components by weight: 100 parts of acrylate polymer matrix, 20-30 parts of polycaprolactone-based thermosensitive repair agent, 5-10 parts of silica nanoparticles, and 2-5 parts of photoinitiator. When the temperature is above 60°C, the polycaprolactone segments soften and undergo molecular chain diffusion, thereby achieving self-repair of interlayer micro-damage.

3. The OLED mobile phone display module with gradient heat dissipation buffer and self-repair function according to claim 2, characterized in that: The silica nanoparticles have a particle size of 20-50 nm.

4. The OLED mobile phone display module with gradient heat dissipation buffer and self-healing function according to claim 1 or 2, characterized in that: The porosity of the porous silica-based gradient pore layer increases from 30% to 70% in the direction away from the backing layer; and the pores are filled with a mixture of thermally conductive silicone grease and carbon nanotubes with a mass ratio of 5-10%.

5. The OLED mobile phone display module with gradient heat dissipation buffer and self-repair function according to claim 4, characterized in that: An anti-interference enhancement layer is arranged between the polarizer layer and the first thermally conductive gel layer. The anti-interference enhancement layer is a composite layer of silver nanowires and transparent polyimide. The silver nanowires are randomly interwoven and oriented along the direction of touch signal transmission, and are filled in the transparent polyimide matrix.

6. The OLED mobile phone display module with gradient heat dissipation buffer and self-repair function according to claim 5, characterized in that: The surface of the silver nanowires is coated with a titanium dioxide coating with a thickness of 5-10 nm.

7. The OLED mobile phone display module with gradient heat dissipation buffer and self-healing function according to claim 5 or 6, characterized in that: The display panel includes a thin-film encapsulation layer, an OLED and thin-film transistor layer, and a modified PI layer. The modified PI layer is formed by uniformly doping aluminum nitride ceramic particles into PI resin, and an aluminum oxide protective film is formed on the surface of the modified PI layer by atomic layer deposition.

8. The OLED mobile phone display module with gradient heat dissipation buffer and self-repair function according to claim 7, characterized in that: The PI resin contains uniformly doped aluminum nitride ceramic particles with a mass ratio of 15-25% and a particle size of 1-3 μm, and the alumina protective film has a thickness of 20-50 nm.

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